<!--SIF Implementation Specification UK 1.1-4 (September 18, 2009)-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" targetNamespace="http://www.sifinfo.org/uk/infrastructure/2.x" xmlns:sif="http://www.sifinfo.org/uk/infrastructure/2.x" elementFormDefault="qualified">
  <xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="imports/xml/xml.xsd" />
  <xs:include schemaLocation="CommonTypes.xsd" />
  <xs:include schemaLocation="CommonElements.xsd" />
  <xs:include schemaLocation="Infrastructure/SIF_ZoneStatus.xsd" />
  <xs:include schemaLocation="Infrastructure/SIF_AgentACL.xsd" />
  <xs:include schemaLocation="DataModel/CommonElements.xsd" />
  <xs:include schemaLocation="SIFUK/AssessmentResultComponent.xsd" />
  <xs:include schemaLocation="SIFUK/AssessmentResultComponentGroup.xsd" />
  <xs:include schemaLocation="SIFUK/AssessmentResultGradeSet.xsd" />
  <xs:include schemaLocation="SIFUK/AssessmentLearnerSet.xsd" />
  <xs:include schemaLocation="SIFUK/AssessmentSession.xsd" />
  <xs:include schemaLocation="SIFUK/AssessmentResponseComponentGroup.xsd" />
  <xs:include schemaLocation="SIFUK/LearnerAssessmentResult.xsd" />
  <xs:include schemaLocation="SIFUK/LearnerAssessmentResponseSet.xsd" />
  <xs:include schemaLocation="SIFUK/AssessmentResponseComponent.xsd" />
  <xs:include schemaLocation="SIFUK/LearnerAttendance.xsd" />
  <xs:include schemaLocation="SIFUK/Identity.xsd" />
  <xs:include schemaLocation="SIFUK/ContactPersonal.xsd" />
  <xs:include schemaLocation="SIFUK/LAInfo.xsd" />
  <xs:include schemaLocation="SIFUK/LearnerAttendanceSummary.xsd" />
  <xs:include schemaLocation="SIFUK/LearnerContact.xsd" />
  <xs:include schemaLocation="SIFUK/LearnerExclusion.xsd" />
  <xs:include schemaLocation="SIFUK/LearnerGroupEnrolment.xsd" />
  <xs:include schemaLocation="SIFUK/LearnerPersonal.xsd" />
  <xs:include schemaLocation="SIFUK/LearnerSchoolEnrolment.xsd" />
  <xs:include schemaLocation="SIFUK/LearnerSpecialNeeds.xsd" />
  <xs:include schemaLocation="SIFUK/PersonPicture.xsd" />
  <xs:include schemaLocation="SIFUK/SchoolGroupType.xsd" />
  <xs:include schemaLocation="SIFUK/SchoolGroup.xsd" />
  <xs:include schemaLocation="SIFUK/SchoolInfo.xsd" />
  <xs:include schemaLocation="SIFUK/TermInfo.xsd" />
  <xs:include schemaLocation="SIFUK/WorkforcePersonal.xsd" />
  <xs:include schemaLocation="Infrastructure/SIF_LogEntry.xsd" />
  <xs:include schemaLocation="ExternalCodeSets/ISO.xsd" />
  <xs:include schemaLocation="ExternalCodeSets/teachernet.xsd" />
  <xs:include schemaLocation="ExternalCodeSets/ONS.xsd" />
  <xs:include schemaLocation="CodeSets/Infrastructure.xsd" />
  <xs:include schemaLocation="CodeSets/SIF_LogEntry.xsd" />
  <xs:include schemaLocation="CodeSets/UK.xsd" />
  <xs:complexType name="SIF_MessageType">
    <xs:annotation>
      <xs:documentation>Contains one of the SIF message types.</xs:documentation>
    </xs:annotation>
    <xs:choice>
      <xs:element ref="sif:SIF_Ack" />
      <xs:element ref="sif:SIF_Event" />
      <xs:element ref="sif:SIF_Provide" />
      <xs:element ref="sif:SIF_Provision" />
      <xs:element ref="sif:SIF_Register" />
      <xs:element ref="sif:SIF_Request" />
      <xs:element ref="sif:SIF_Response" />
      <xs:element ref="sif:SIF_Subscribe" />
      <xs:element ref="sif:SIF_SystemControl" />
      <xs:element ref="sif:SIF_Unprovide" />
      <xs:element ref="sif:SIF_Unregister" />
      <xs:element ref="sif:SIF_Unsubscribe" />
    </xs:choice>
    <!--<xs:attribute name="xmlns" use="optional" type="xs:anyURI">
  <xs:annotation>
    <xs:documentation>
              The xmlns attribute specifies the XML namespace for SIF messages.
              For this version of the specification, the value of this attribute MUST be http://www.sifinfo.org/uk/infrastructure/2.x. This XML namespace value will remain the same until the next major release of SIF (3.0).
            </xs:documentation>
  </xs:annotation>
</xs:attribute>-->
    <xs:attribute name="Version" use="required" type="sif:VersionType">
      <xs:annotation>
        <xs:documentation>
              The version of the SIF Implementation Specification that defines this message's XML structure.
              For this version of the specification, the value of this attribute is 2.1.
              This attribute can be used by ZIS and agent implementations to choose schema files to
              validate the message's XML.
            </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>

  <xs:element name="SIF_Message" type="sif:SIF_MessageType" />

  <xs:complexType name="SIF_HeaderType">
    <xs:annotation>
      <xs:documentation>Header information associated with a message.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="SIF_MsgId" type="sif:MsgIdType">
        <xs:annotation>
          <xs:documentation>SIF_MsgId is a globally unique message identifier from the Agent or ZIS that sends out the message.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="SIF_Timestamp" type="xs:dateTime">
        <xs:annotation>
          <xs:documentation>Timestamp of when the message was sent.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="SIF_Security" minOccurs="0">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_SecureChannel">
              <xs:complexType>
                <xs:sequence>
                  <xs:element ref="sif:SIF_AuthenticationLevel" />
                  <xs:element ref="sif:SIF_EncryptionLevel" />
                </xs:sequence>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_SourceId">
        <xs:simpleType>
          <xs:restriction base="xs:token">
            <xs:annotation>
              <xs:documentation>The SIF_SourceId is the ID of the originator of the message. Each source needs to have a zone unique case-sensitive identifier.</xs:documentation>
            </xs:annotation>
            <xs:maxLength value="64" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:element name="SIF_DestinationId" minOccurs="0">
        <xs:simpleType>
          <xs:restriction base="xs:token">
            <xs:annotation>
              <xs:documentation>This element represents the ID of the recipient of the message and may be present as follows:</xs:documentation>
            </xs:annotation>
            <xs:maxLength value="64" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:element ref="sif:SIF_Contexts" minOccurs="0" />
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Header" type="sif:SIF_HeaderType" />

  <xs:simpleType name="SIF_EncryptionLevelType">
    <xs:restriction base="xs:unsignedInt">
      <xs:annotation>
        <xs:documentation>The minimum level of encryption required by the message originator to be considered a secure channel upon message delivery to other agents.</xs:documentation>
      </xs:annotation>
      <xs:enumeration value="0">
        <xs:annotation>
          <xs:documentation>No encryption required</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="1">
        <xs:annotation>
          <xs:documentation>Symmetric key length of at least 40 bits is to be used</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="2">
        <xs:annotation>
          <xs:documentation>Symmetric key length of at least 56 bits is to be used</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="3">
        <xs:annotation>
          <xs:documentation>Symmetric key length of at least 80 bits is to be used</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="4">
        <xs:annotation>
          <xs:documentation>Symmetric key length of at least 128 bits is to be used</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>

  <xs:element name="SIF_EncryptionLevel" type="sif:SIF_EncryptionLevelType" />

  <xs:simpleType name="SIF_AuthenticationLevelType">
    <xs:restriction base="xs:unsignedInt">
      <xs:annotation>
        <xs:documentation>The minimum level of authentication required by the message originator to be considered a secure channel upon message delivery to other agents.</xs:documentation>
      </xs:annotation>
      <xs:enumeration value="0">
        <xs:annotation>
          <xs:documentation>No authentication required and a valid certificate does not need to be presented.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="1">
        <xs:annotation>
          <xs:documentation>A valid certificate must be presented.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="2">
        <xs:annotation>
          <xs:documentation>
                A valid certificate from a trusted certificate
                authority must be presented.
              </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="3">
        <xs:annotation>
          <xs:documentation>
                A valid certificate from a trusted certificate
                authority must be presented and the CN field of the certificate's
                Subject entry must match the host sending the certificate.
              </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>

  <xs:element name="SIF_AuthenticationLevel" type="sif:SIF_AuthenticationLevelType" />

  <xs:complexType name="SIF_ContextsType">
    <xs:annotation>
      <xs:documentation>
              A list of SIF contexts that applies to a message or operation.  Typically where used as an optional element,
              the omission of this element implies the SIF_Default context applies.
            </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref="sif:SIF_Context" maxOccurs="unbounded" />
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Contexts" type="sif:SIF_ContextsType" />

  <xs:simpleType name="SIF_ContextType">
    <xs:restriction>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:annotation>
            <xs:documentation>The name of a SIF Context that applies to a message or operation.</xs:documentation>
          </xs:annotation>
          <xs:maxLength value="64" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
        </xs:restriction>
      </xs:simpleType>
    </xs:restriction>
  </xs:simpleType>

  <xs:element name="SIF_Context" type="sif:SIF_ContextType" />

  <xs:complexType name="SIF_ProtocolType">
    <xs:annotation>
      <xs:documentation>Contains protocol information regarding a ZIS or Agent.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="SIF_URL" minOccurs="0">
        <xs:simpleType>
          <xs:restriction base="xs:anyURI">
            <xs:annotation>
              <xs:documentation>This element is required if the protocol is HTTPS or HTTP. 
            It contains the https or http URL for contacting the agent.</xs:documentation>
            </xs:annotation>
            <xs:maxLength value="256" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:element name="SIF_Property" minOccurs="0" maxOccurs="unbounded">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Name">
              <xs:simpleType>
                <xs:restriction base="xs:token">
                  <xs:annotation>
                    <xs:documentation>
              Property name.
            </xs:documentation>
                  </xs:annotation>
                  <xs:maxLength value="64" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
                </xs:restriction>
              </xs:simpleType>
            </xs:element>
            <xs:element name="SIF_Value">
              <xs:simpleType>
                <xs:restriction base="xs:string">
                  <xs:annotation>
                    <xs:documentation>
              Property value.
            </xs:documentation>
                  </xs:annotation>
                  <xs:maxLength value="256" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
                </xs:restriction>
              </xs:simpleType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
    <xs:attribute name="Type" use="required">
      <xs:annotation>
        <xs:documentation>The type of protocol to use (HTTPS, HTTP or an implementation-defined protocol).</xs:documentation>
      </xs:annotation>
      <xs:simpleType>
        <xs:union>
          <xs:simpleType>
            <xs:restriction base="sif:DefinedProtocolsType" />
          </xs:simpleType>
          <xs:simpleType>
            <xs:restriction base="xs:token" />
          </xs:simpleType>
        </xs:union>
      </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="Secure" use="required">
      <xs:annotation>
        <xs:documentation>Whether the protocol provides a secure channel.</xs:documentation>
      </xs:annotation>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="Yes" />
          <xs:enumeration value="No" />
        </xs:restriction>
      </xs:simpleType>
    </xs:attribute>
  </xs:complexType>

  <xs:element name="SIF_Protocol" type="sif:SIF_ProtocolType" />

  <xs:complexType name="SIF_StatusType">
    <xs:annotation>
      <xs:documentation>This element is used to signal a successful response.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="SIF_Code" type="sif:InfrastructureStatusCodeType" />
      <xs:element name="SIF_Desc" minOccurs="0">
        <xs:simpleType>
          <xs:restriction base="xs:string">
            <xs:annotation>
              <xs:documentation>
              An optional textual description/equivalent of SIF_Code.
            </xs:documentation>
            </xs:annotation>
            <xs:maxLength value="1024" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:element name="SIF_Data" minOccurs="0">
        <xs:annotation>
          <xs:documentation>
              Optional element to hold data related to a successful operation.  This data is currently limited
              to a SIF_Message returned by the ZIS in response to a Pull-Mode Agent's SIF_GetMessage,
              SIF_AgentACL returned by the ZIS in response to SIF_Register and SIF_GetAgentACL,
              and SIF_ZoneStatus returned by the ZIS in response to SIF_GetZoneStatus.
            </xs:documentation>
        </xs:annotation>
        <xs:complexType>
          <xs:choice>
            <xs:element ref="sif:SIF_Message" />
            <xs:element name="SIF_AgentACL" type="sif:SIF_AgentACLInfrastructureType" />
            <xs:element name="SIF_ZoneStatus" type="sif:SIF_ZoneStatusInfrastructureType" />
          </xs:choice>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Status" type="sif:SIF_StatusType" />

  <xs:complexType name="SIF_ErrorType">
    <xs:annotation>
      <xs:documentation>This element is used to signal an unsuccessful response.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="SIF_Category" type="sif:InfrastructureErrorCategoryType" />
      <xs:element name="SIF_Code">
        <xs:annotation>
          <xs:documentation>
              See Error Codes.
            </xs:documentation>
        </xs:annotation>
        <xs:simpleType>
          <xs:union>
            <xs:simpleType>
              <xs:restriction base="sif:InfrastructureXMLValidationErrorType" />
            </xs:simpleType>
            <xs:simpleType>
              <xs:restriction base="sif:InfrastructureEncryptionErrorType" />
            </xs:simpleType>
            <xs:simpleType>
              <xs:restriction base="sif:InfrastructureAuthenticationErrorType" />
            </xs:simpleType>
            <xs:simpleType>
              <xs:restriction base="sif:InfrastructureAccessAndPermissionErrorType" />
            </xs:simpleType>
            <xs:simpleType>
              <xs:restriction base="sif:InfrastructureRegistrationErrorType" />
            </xs:simpleType>
            <xs:simpleType>
              <xs:restriction base="sif:InfrastructureProvisionErrorType" />
            </xs:simpleType>
            <xs:simpleType>
              <xs:restriction base="sif:InfrastructureSubscriptionErrorType" />
            </xs:simpleType>
            <xs:simpleType>
              <xs:restriction base="sif:InfrastructureRequestAndResponseErrorType" />
            </xs:simpleType>
            <xs:simpleType>
              <xs:restriction base="sif:InfrastructureEventReportingAndProcessingErrorType" />
            </xs:simpleType>
            <xs:simpleType>
              <xs:restriction base="sif:InfrastructureTransportErrorType" />
            </xs:simpleType>
            <xs:simpleType>
              <xs:restriction base="sif:InfrastructureSystemErrorType" />
            </xs:simpleType>
            <xs:simpleType>
              <xs:restriction base="sif:InfrastructureGenericMessageHandlingErrorType" />
            </xs:simpleType>
            <xs:simpleType>
              <xs:restriction base="xs:token" />
            </xs:simpleType>
          </xs:union>
        </xs:simpleType>
      </xs:element>
      <xs:element name="SIF_Desc">
        <xs:simpleType>
          <xs:restriction base="xs:string">
            <xs:annotation>
              <xs:documentation>A simple, easy to understand, description of the error. The primary consumer of this message is the application user. Example: "Unable to open database."</xs:documentation>
            </xs:annotation>
            <xs:maxLength value="1024" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:element name="SIF_ExtendedDesc" minOccurs="0" type="xs:string">
        <xs:annotation>
          <xs:documentation>An optional error description that is more complete and technical in nature. It is to be used as a diagnostic message in trouble-shooting procedures. Example: "The 'Students' table is opened in exclusive mode by user 'ADM1' (dbm.cpp, line 300)."</xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Error" type="sif:SIF_ErrorType" />

  <xs:complexType name="SIF_QueryType">
    <xs:annotation>
      <xs:documentation>SIF's default query mechanism.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="SIF_QueryObject">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Element" minOccurs="0" maxOccurs="unbounded" type="xs:normalizedString">
              <xs:annotation>
                <xs:documentation>Individual elements/attributes being requested of matching object.  See SIF_Element Syntax below. 
						If specified, only the elements/attributes requested are returned in the SIF_Response (with any parent elements/attributes); 
						otherwise, all elements supported by the provider's object are returned.</xs:documentation>
              </xs:annotation>
            </xs:element>
          </xs:sequence>
          <xs:attribute name="ObjectName" use="required" type="sif:SIF_RequestObjectNamesType">
            <xs:annotation>
              <xs:documentation>The actual name of the object that is being queried for.</xs:documentation>
            </xs:annotation>
          </xs:attribute>
        </xs:complexType>
      </xs:element>
      <xs:choice minOccurs="0">
        <xs:element name="SIF_ConditionGroup">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="SIF_Conditions" maxOccurs="unbounded">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element name="SIF_Condition" maxOccurs="unbounded">
                      <xs:complexType>
                        <xs:sequence>
                          <xs:element name="SIF_Element" type="xs:normalizedString">
                            <xs:annotation>
                              <xs:documentation>This is the element/attribute being queried.  See below for syntax.</xs:documentation>
                            </xs:annotation>
                          </xs:element>
                          <xs:element name="SIF_Operator">
                            <xs:annotation>
                              <xs:documentation>The comparison operator for the condition.</xs:documentation>
                            </xs:annotation>
                            <xs:simpleType>
                              <xs:restriction base="xs:token">
                                <xs:enumeration value="EQ">
                                  <xs:annotation>
                                    <xs:documentation>Equals</xs:documentation>
                                  </xs:annotation>
                                </xs:enumeration>
                                <xs:enumeration value="LT">
                                  <xs:annotation>
                                    <xs:documentation>Less Than</xs:documentation>
                                  </xs:annotation>
                                </xs:enumeration>
                                <xs:enumeration value="GT">
                                  <xs:annotation>
                                    <xs:documentation>Greater Than</xs:documentation>
                                  </xs:annotation>
                                </xs:enumeration>
                                <xs:enumeration value="LE">
                                  <xs:annotation>
                                    <xs:documentation>Less Than Or Equals</xs:documentation>
                                  </xs:annotation>
                                </xs:enumeration>
                                <xs:enumeration value="GE">
                                  <xs:annotation>
                                    <xs:documentation>Greater Than Or Equals</xs:documentation>
                                  </xs:annotation>
                                </xs:enumeration>
                                <xs:enumeration value="NE">
                                  <xs:annotation>
                                    <xs:documentation>Not Equals</xs:documentation>
                                  </xs:annotation>
                                </xs:enumeration>
                              </xs:restriction>
                            </xs:simpleType>
                          </xs:element>
                          <xs:element name="SIF_Value" type="xs:string">
                            <xs:annotation>
                              <xs:documentation>SIF_Value is the data that is used to compare with the value of the element or attribute.</xs:documentation>
                            </xs:annotation>
                          </xs:element>
                        </xs:sequence>
                      </xs:complexType>
                    </xs:element>
                  </xs:sequence>
                  <xs:attribute name="Type" use="required">
                    <xs:annotation>
                      <xs:documentation>
								The boolean operator for joining conditions (SIF_Condition elements) within this element.  Note that None should be used if there
								is only one SIF_Condition element.
							</xs:documentation>
                    </xs:annotation>
                    <xs:simpleType>
                      <xs:restriction base="xs:token">
                        <xs:enumeration value="And" />
                        <xs:enumeration value="Or" />
                        <xs:enumeration value="None" />
                      </xs:restriction>
                    </xs:simpleType>
                  </xs:attribute>
                </xs:complexType>
              </xs:element>
            </xs:sequence>
            <xs:attribute name="Type" use="required">
              <xs:annotation>
                <xs:documentation>
								The Boolean operator for joining conditions (SIF_Conditions elements) within this element.  Note that None should be used if there is only one
								SIF_Conditions element.
							</xs:documentation>
              </xs:annotation>
              <xs:simpleType>
                <xs:restriction base="xs:token">
                  <xs:enumeration value="And" />
                  <xs:enumeration value="Or" />
                  <xs:enumeration value="None" />
                </xs:restriction>
              </xs:simpleType>
            </xs:attribute>
          </xs:complexType>
        </xs:element>
        <xs:element name="SIF_Example" type="sif:SIF_ExampleObjectType">
          <xs:annotation>
            <xs:documentation>
							An example SIF object that serves as a template for matching objects.  There is an implied EQ operator
							for every element/attribute value present and an implied And group of all resulting conditions.  Currently
							this is an experimental feature and limited to use with select objects; wider use may be considered in future
							versions of this specification.
						</xs:documentation>
          </xs:annotation>
        </xs:element>
      </xs:choice>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Query" type="sif:SIF_QueryType" />

  <xs:complexType name="SIF_ExtendedQueryType">
    <xs:annotation>
      <xs:documentation>SIF's default query mechanism for SIF_Request, SIF_Query, has several limitations that limit its usefulness when creating reporting applications
						that process data from a SIF zone.  SIF_Query is limited to matching only one object type per query, requiring applications to
						manually join together results as needed for reporting and general data processing.  SIF_ExtendedQuery is designed to allow for joins on
						object identifiers/RefIds and to allow retrieval of data in a row/column fashion similar to SQL.  Each returned column may contain hierarchical XML elements/objects.
						Providers and Responders in a Zone may support SIF_ExtendedQuery
							in addition to SIF_Query.  Support for SIF_ExtendedQuery can be declared in and retrieved from the Zone is various Infrastructure
							messages and objects.
						</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="SIF_DestinationProvider" minOccurs="0" type="sif:SIF_RequestObjectNamesType">
        <xs:annotation>
          <xs:documentation>
              If no SIF_DestinationId applies to the request and this element is supplied, the Requester specifies that the
              extended query be routed to the Provider on record for the given object name.  If this element is omitted and no SIF_DestinationId
              applies to the request, the ZIS routes the request to the Provider on record for the object name in SIF_From.
            </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="SIF_Select">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Element" maxOccurs="unbounded">
              <xs:annotation>
                <xs:documentation>Indicates the element/attribute to return as a column.  Contents can be left empty to return the whole object specified in ObjectName,
						or * can be designated to return all attributes and immediate child elements of the object specified in ObjectName, or 
							SIF_Element Syntax can be specified, relative to the object specified in ObjectName.  Requested attributes
							are to be returned as the text value of the corresponding attribute, elements as a copy of the XML element itself including attributes if they exist.
					</xs:documentation>
              </xs:annotation>
              <xs:complexType>
                <xs:simpleContent>
                  <xs:extension base="xs:normalizedString">
                    <xs:attribute name="Alias" use="optional">
                      <xs:simpleType>
                        <xs:restriction base="xs:normalizedString">
                          <xs:annotation>
                            <xs:documentation>Optional caption for the column.</xs:documentation>
                          </xs:annotation>
                          <xs:maxLength value="64" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
                        </xs:restriction>
                      </xs:simpleType>
                    </xs:attribute>
                    <xs:attribute name="ObjectName" use="required" type="sif:SIF_RequestObjectNamesType">
                      <xs:annotation>
                        <xs:documentation>The name of the object from which to retrieve element/attributes.</xs:documentation>
                      </xs:annotation>
                    </xs:attribute>
                  </xs:extension>
                </xs:simpleContent>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
          <xs:attribute name="Distinct" use="required" type="xs:boolean">
            <xs:annotation>
              <xs:documentation>Specifies whether query results should return all rows (false) or just distinct ones (true).  Rows are distinct if
						at least one column differs between them.</xs:documentation>
            </xs:annotation>
          </xs:attribute>
          <xs:attribute name="RowCount" use="required">
            <xs:annotation>
              <xs:documentation>The maximum number of rows to return.  If All, return all rows, otherwise return the top rows up to the maximum
						row count indicated.
					</xs:documentation>
            </xs:annotation>
            <xs:simpleType>
              <xs:union>
                <xs:simpleType>
                  <xs:restriction base="xs:positiveInteger" />
                </xs:simpleType>
                <xs:simpleType>
                  <xs:restriction base="xs:token">
                    <xs:enumeration value="All" />
                  </xs:restriction>
                </xs:simpleType>
              </xs:union>
            </xs:simpleType>
          </xs:attribute>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_From">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Join" minOccurs="0" maxOccurs="unbounded">
              <xs:complexType>
                <xs:sequence>
                  <xs:element name="SIF_JoinOn" maxOccurs="unbounded">
                    <xs:complexType>
                      <xs:sequence>
                        <xs:element name="SIF_LeftElement">
                          <xs:annotation>
                            <xs:documentation>Specifies the left-side element/attribute on which to constrain the join.  Currently only support for keys/RefIds/RefId references is required.</xs:documentation>
                          </xs:annotation>
                          <xs:complexType>
                            <xs:simpleContent>
                              <xs:extension base="xs:normalizedString">
                                <xs:attribute name="ObjectName" use="required" type="sif:SIF_RequestObjectNamesType">
                                  <xs:annotation>
                                    <xs:documentation>Name of the object that contains the element/attribute.</xs:documentation>
                                  </xs:annotation>
                                </xs:attribute>
                              </xs:extension>
                            </xs:simpleContent>
                          </xs:complexType>
                        </xs:element>
                        <xs:element name="SIF_RightElement">
                          <xs:annotation>
                            <xs:documentation>Specifies right left-side element/attribute on which to constrain the join.  Currently only support for keys/RefIds/RefId references is required.</xs:documentation>
                          </xs:annotation>
                          <xs:complexType>
                            <xs:simpleContent>
                              <xs:extension base="xs:normalizedString">
                                <xs:attribute name="ObjectName" use="required" type="sif:SIF_RequestObjectNamesType">
                                  <xs:annotation>
                                    <xs:documentation>Name of the object that contains the element/attribute.</xs:documentation>
                                  </xs:annotation>
                                </xs:attribute>
                              </xs:extension>
                            </xs:simpleContent>
                          </xs:complexType>
                        </xs:element>
                      </xs:sequence>
                    </xs:complexType>
                  </xs:element>
                </xs:sequence>
                <xs:attribute name="Type" use="required">
                  <xs:annotation>
                    <xs:documentation>Type of relational join.</xs:documentation>
                  </xs:annotation>
                  <xs:simpleType>
                    <xs:restriction base="xs:token">
                      <xs:enumeration value="Inner" />
                      <xs:enumeration value="LeftOuter" />
                      <xs:enumeration value="RightOuter" />
                      <xs:enumeration value="FullOuter" />
                    </xs:restriction>
                  </xs:simpleType>
                </xs:attribute>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
          <xs:attribute name="ObjectName" use="required" type="sif:SIF_RequestObjectNamesType">
            <xs:annotation>
              <xs:documentation>The name of the object to query.</xs:documentation>
            </xs:annotation>
          </xs:attribute>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_Where" minOccurs="0">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_ConditionGroup">
              <xs:complexType>
                <xs:sequence>
                  <xs:element name="SIF_Conditions" maxOccurs="unbounded">
                    <xs:complexType>
                      <xs:sequence>
                        <xs:element name="SIF_Condition" maxOccurs="unbounded">
                          <xs:complexType>
                            <xs:sequence>
                              <xs:element name="SIF_Element">
                                <xs:annotation>
                                  <xs:documentation>This is the element/attribute being queried.</xs:documentation>
                                </xs:annotation>
                                <xs:complexType>
                                  <xs:simpleContent>
                                    <xs:extension base="xs:normalizedString">
                                      <xs:attribute name="ObjectName" use="required" type="sif:SIF_RequestObjectNamesType">
                                        <xs:annotation>
                                          <xs:documentation>The name of the object containing the element/attribute.</xs:documentation>
                                        </xs:annotation>
                                      </xs:attribute>
                                    </xs:extension>
                                  </xs:simpleContent>
                                </xs:complexType>
                              </xs:element>
                              <xs:element name="SIF_Operator">
                                <xs:annotation>
                                  <xs:documentation>The comparison operator for the condition.</xs:documentation>
                                </xs:annotation>
                                <xs:simpleType>
                                  <xs:restriction base="xs:token">
                                    <xs:enumeration value="EQ">
                                      <xs:annotation>
                                        <xs:documentation>Equals</xs:documentation>
                                      </xs:annotation>
                                    </xs:enumeration>
                                    <xs:enumeration value="LT">
                                      <xs:annotation>
                                        <xs:documentation>Less Than</xs:documentation>
                                      </xs:annotation>
                                    </xs:enumeration>
                                    <xs:enumeration value="GT">
                                      <xs:annotation>
                                        <xs:documentation>Greater Than</xs:documentation>
                                      </xs:annotation>
                                    </xs:enumeration>
                                    <xs:enumeration value="LE">
                                      <xs:annotation>
                                        <xs:documentation>Less Than Or Equals</xs:documentation>
                                      </xs:annotation>
                                    </xs:enumeration>
                                    <xs:enumeration value="GE">
                                      <xs:annotation>
                                        <xs:documentation>Greater Than Or Equals</xs:documentation>
                                      </xs:annotation>
                                    </xs:enumeration>
                                    <xs:enumeration value="NE">
                                      <xs:annotation>
                                        <xs:documentation>Not Equals</xs:documentation>
                                      </xs:annotation>
                                    </xs:enumeration>
                                  </xs:restriction>
                                </xs:simpleType>
                              </xs:element>
                              <xs:element name="SIF_Value" type="xs:string">
                                <xs:annotation>
                                  <xs:documentation>SIF_Value is the data that is used to compare with the value of the element or attribute.</xs:documentation>
                                </xs:annotation>
                              </xs:element>
                            </xs:sequence>
                          </xs:complexType>
                        </xs:element>
                      </xs:sequence>
                      <xs:attribute name="Type" use="required">
                        <xs:annotation>
                          <xs:documentation>
								The boolean operator for joining conditions (SIF_Condition elements) within this element.  Note that None should be used if there
								is only one SIF_Condition element.
							</xs:documentation>
                        </xs:annotation>
                        <xs:simpleType>
                          <xs:restriction base="xs:token">
                            <xs:enumeration value="And" />
                            <xs:enumeration value="Or" />
                            <xs:enumeration value="None" />
                          </xs:restriction>
                        </xs:simpleType>
                      </xs:attribute>
                    </xs:complexType>
                  </xs:element>
                </xs:sequence>
                <xs:attribute name="Type" use="required">
                  <xs:annotation>
                    <xs:documentation>
								The Boolean operator for joining conditions (SIF_Conditions elements) within this element.  Note that None should be used if there is only one
								SIF_Conditions element.
							</xs:documentation>
                  </xs:annotation>
                  <xs:simpleType>
                    <xs:restriction base="xs:token">
                      <xs:enumeration value="And" />
                      <xs:enumeration value="Or" />
                      <xs:enumeration value="None" />
                    </xs:restriction>
                  </xs:simpleType>
                </xs:attribute>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_OrderBy" minOccurs="0">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Element" maxOccurs="unbounded">
              <xs:annotation>
                <xs:documentation>
							Indicates the element/attribute by which to sort.
						</xs:documentation>
              </xs:annotation>
              <xs:complexType>
                <xs:simpleContent>
                  <xs:extension base="xs:normalizedString">
                    <xs:attribute name="ObjectName" use="required" type="sif:SIF_RequestObjectNamesType">
                      <xs:annotation>
                        <xs:documentation>The name of the object containing the element/attribute.</xs:documentation>
                      </xs:annotation>
                    </xs:attribute>
                    <xs:attribute name="Ordering" use="required">
                      <xs:annotation>
                        <xs:documentation>Whether to order the element/attribute in ascending or descending order.</xs:documentation>
                      </xs:annotation>
                      <xs:simpleType>
                        <xs:restriction base="xs:token">
                          <xs:enumeration value="Ascending" />
                          <xs:enumeration value="Descending" />
                        </xs:restriction>
                      </xs:simpleType>
                    </xs:attribute>
                  </xs:extension>
                </xs:simpleContent>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_ExtendedQuery" type="sif:SIF_ExtendedQueryType" />

  <xs:complexType name="SIF_ExtendedQueryResultsType">
    <xs:annotation>
      <xs:documentation>
              This element provides a wrapper for data returned in response to a SIF_ExtendedQuery.  Used in SIF_Response
              and SIF_ReportObject.
            </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="SIF_ColumnHeaders">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Element" maxOccurs="unbounded">
              <xs:annotation>
                <xs:documentation>The element/attribute specified for the column in SIF_ExtendedQuery.</xs:documentation>
              </xs:annotation>
              <xs:complexType>
                <xs:simpleContent>
                  <xs:extension base="xs:normalizedString">
                    <xs:attribute name="ObjectName" use="required" type="sif:SIF_RequestObjectNamesType">
                      <xs:annotation>
                        <xs:documentation>The object in which the element/attribute occurs.</xs:documentation>
                      </xs:annotation>
                    </xs:attribute>
                    <xs:attribute name="Alias" use="optional">
                      <xs:simpleType>
                        <xs:restriction base="xs:normalizedString">
                          <xs:annotation>
                            <xs:documentation>The caption for the column, if specified in SIF_ExtendedQuery.
					</xs:documentation>
                          </xs:annotation>
                          <xs:maxLength value="64" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
                        </xs:restriction>
                      </xs:simpleType>
                    </xs:attribute>
                    <!--<xs:attribute ref="xsi:type" use="optional" />-->
                  </xs:extension>
                </xs:simpleContent>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_Rows">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="R" minOccurs="0" maxOccurs="unbounded">
              <xs:complexType>
                <xs:sequence>
                  <xs:element name="C" maxOccurs="unbounded" type="sif:SelectedContentType">
                    <xs:annotation>
                      <xs:documentation>
              Contains the value of each column specified in SIF_ExtendedQuery/SIF_Select.  
							The order of the columns must correspond to the order of the elements as requested in SIF_ExtendedQuery.
							Note the number of columns may be expanded from the requested columns if * is indicated
							one or more times in the SIF_Select clause.
            </xs:documentation>
                    </xs:annotation>
                  </xs:element>
                </xs:sequence>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_ExtendedQueryResults" type="sif:SIF_ExtendedQueryResultsType" />

  <xs:complexType name="SIF_AckType">
    <xs:annotation>
      <xs:documentation>This message is used as an acknowledgement to an infrastructure message.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref="sif:SIF_Header" />
      <xs:element name="SIF_OriginalSourceId" nillable="true" type="xs:token">
        <xs:annotation>
          <xs:documentation>The SIF_SourceId of the infrastructure message for which the SIF_Ack serves as a response.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="SIF_OriginalMsgId" nillable="true" type="sif:MsgIdType">
        <xs:annotation>
          <xs:documentation>The SIF_MsgId of the infrastructure message for which the SIF_Ack message serves as a response.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:choice>
        <xs:element ref="sif:SIF_Status" />
        <xs:element ref="sif:SIF_Error" />
      </xs:choice>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Ack" type="sif:SIF_AckType" />

  <xs:complexType name="SIF_EventType">
    <xs:annotation>
      <xs:documentation>SIF_Event is used to deliver event objects as defined in SIF.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref="sif:SIF_Header" />
      <xs:element name="SIF_ObjectData">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_EventObject">
              <xs:complexType>
                <xs:annotation>
                  <xs:documentation>Contains the actual object (partial or whole) that is being added, changed or deleted.</xs:documentation>
                </xs:annotation>
                <xs:complexContent>
                  <xs:extension base="sif:SIF_EventObjectType">
                    <xs:attribute name="ObjectName" use="required" type="sif:SIF_SubscribeObjectNamesType">
                      <xs:annotation>
                        <xs:documentation>This is the name of the object being added, changed or deleted.</xs:documentation>
                      </xs:annotation>
                    </xs:attribute>
                    <xs:attribute name="Action" use="required">
                      <xs:annotation>
                        <xs:documentation>This is the action associated with the object that is being conveyed by this SIF_Event.</xs:documentation>
                      </xs:annotation>
                      <xs:simpleType>
                        <xs:restriction base="xs:token">
                          <xs:enumeration value="Add" />
                          <xs:enumeration value="Delete" />
                          <xs:enumeration value="Change" />
                        </xs:restriction>
                      </xs:simpleType>
                    </xs:attribute>
                  </xs:extension>
                </xs:complexContent>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Event" type="sif:SIF_EventType" />

  <xs:complexType name="SIF_ProvideType">
    <xs:annotation>
      <xs:documentation>The SIF_Provide message is used for advertising the provision of data objects.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref="sif:SIF_Header" />
      <xs:element name="SIF_Object" maxOccurs="unbounded">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_ExtendedQuerySupport" minOccurs="0" type="xs:boolean">
              <xs:annotation>
                <xs:documentation>Whether or not the Agent supports SIF_ExtendedQuery for this object.</xs:documentation>
              </xs:annotation>
            </xs:element>
            <xs:element ref="sif:SIF_Contexts" minOccurs="0" />
          </xs:sequence>
          <xs:attribute name="ObjectName" use="required" type="sif:SIF_ProvideObjectNamesType">
            <xs:annotation>
              <xs:documentation>The actual name of the object that is being provided.</xs:documentation>
            </xs:annotation>
          </xs:attribute>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Provide" type="sif:SIF_ProvideType" />

  <xs:complexType name="SIF_ProvisionType">
    <xs:annotation>
      <xs:documentation>
			Once registered, this message allows an agent to announce to the ZIS the functionality the agent will provide.
			The ZIS compares the functionality to its access control list and either returns a failure or a success.  Upon success,
			the ZIS performs an atomic update of its provide/subscribe database entries for the agent to match the objects listed in this message and atomically
			updates other stored settings for the agent.
			A ZIS must not allow an agent to perform operations that it did not successfully announce.  Agents should be aware that if the access control
			list changes after a successful SIF_Provision, some operations may still be rejected with access control errors.
		</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref="sif:SIF_Header" />
      <xs:element name="SIF_ProvideObjects">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Object" minOccurs="0" maxOccurs="unbounded">
              <xs:complexType>
                <xs:sequence>
                  <xs:element name="SIF_ExtendedQuerySupport" minOccurs="0" type="xs:boolean">
                    <xs:annotation>
                      <xs:documentation>Whether or not SIF_ExtendedQuery is supported with regard to this object.</xs:documentation>
                    </xs:annotation>
                  </xs:element>
                  <xs:element ref="sif:SIF_Contexts" minOccurs="0" />
                </xs:sequence>
                <xs:attribute name="ObjectName" use="required" type="sif:SIF_ProvideObjectNamesType">
                  <xs:annotation>
                    <xs:documentation>The name of each object.</xs:documentation>
                  </xs:annotation>
                </xs:attribute>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_SubscribeObjects">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Object" minOccurs="0" maxOccurs="unbounded">
              <xs:complexType>
                <xs:sequence>
                  <xs:element ref="sif:SIF_Contexts" minOccurs="0" />
                </xs:sequence>
                <xs:attribute name="ObjectName" use="required" type="sif:SIF_SubscribeObjectNamesType">
                  <xs:annotation>
                    <xs:documentation>The name of each object.</xs:documentation>
                  </xs:annotation>
                </xs:attribute>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_PublishAddObjects">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Object" minOccurs="0" maxOccurs="unbounded">
              <xs:complexType>
                <xs:sequence>
                  <xs:element ref="sif:SIF_Contexts" minOccurs="0" />
                </xs:sequence>
                <xs:attribute name="ObjectName" use="required" type="sif:SIF_SubscribeObjectNamesType">
                  <xs:annotation>
                    <xs:documentation>The name of each object.</xs:documentation>
                  </xs:annotation>
                </xs:attribute>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_PublishChangeObjects">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Object" minOccurs="0" maxOccurs="unbounded">
              <xs:complexType>
                <xs:sequence>
                  <xs:element ref="sif:SIF_Contexts" minOccurs="0" />
                </xs:sequence>
                <xs:attribute name="ObjectName" use="required" type="sif:SIF_SubscribeObjectNamesType">
                  <xs:annotation>
                    <xs:documentation>The name of each object.</xs:documentation>
                  </xs:annotation>
                </xs:attribute>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_PublishDeleteObjects">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Object" minOccurs="0" maxOccurs="unbounded">
              <xs:complexType>
                <xs:sequence>
                  <xs:element ref="sif:SIF_Contexts" minOccurs="0" />
                </xs:sequence>
                <xs:attribute name="ObjectName" use="required" type="sif:SIF_SubscribeObjectNamesType">
                  <xs:annotation>
                    <xs:documentation>The name of each object.</xs:documentation>
                  </xs:annotation>
                </xs:attribute>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_RequestObjects">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Object" minOccurs="0" maxOccurs="unbounded">
              <xs:complexType>
                <xs:sequence>
                  <xs:element name="SIF_ExtendedQuerySupport" minOccurs="0" type="xs:boolean">
                    <xs:annotation>
                      <xs:documentation>
							Optionally specify whether or not SIF_ExtendedQuery may be sent in requests for this object.
						</xs:documentation>
                    </xs:annotation>
                  </xs:element>
                  <xs:element ref="sif:SIF_Contexts" minOccurs="0" />
                </xs:sequence>
                <xs:attribute name="ObjectName" use="required" type="sif:SIF_RequestObjectNamesType">
                  <xs:annotation>
                    <xs:documentation>The name of each object.</xs:documentation>
                  </xs:annotation>
                </xs:attribute>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_RespondObjects">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Object" minOccurs="0" maxOccurs="unbounded">
              <xs:complexType>
                <xs:sequence>
                  <xs:element name="SIF_ExtendedQuerySupport" minOccurs="0" type="xs:boolean">
                    <xs:annotation>
                      <xs:documentation>
			Whether or not SIF_ExtendedQuery is supported with regard to this object.
		</xs:documentation>
                    </xs:annotation>
                  </xs:element>
                  <xs:element ref="sif:SIF_Contexts" minOccurs="0" />
                </xs:sequence>
                <xs:attribute name="ObjectName" use="required" type="sif:SIF_RequestObjectNamesType">
                  <xs:annotation>
                    <xs:documentation>The name of each object.</xs:documentation>
                  </xs:annotation>
                </xs:attribute>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Provision" type="sif:SIF_ProvisionType" />

  <xs:complexType name="SIF_RegisterType">
    <xs:annotation>
      <xs:documentation>SIF_Register is the message for registering an agent with a ZIS.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref="sif:SIF_Header" />
      <xs:element name="SIF_Name">
        <xs:simpleType>
          <xs:restriction base="xs:normalizedString">
            <xs:annotation>
              <xs:documentation>This is the descriptive name of the agent that is registering (i.e. Ramsey Media Center).</xs:documentation>
            </xs:annotation>
            <xs:maxLength value="64" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:element name="SIF_Version" maxOccurs="unbounded" type="sif:VersionWithWildcardsType">
        <xs:annotation>
          <xs:documentation>Specifies the SIF Implementation Specification version(s) defining messages the agent can receive. If the ZIS cannot communicate in this format, it should reject the request.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="SIF_MaxBufferSize" type="xs:unsignedInt">
        <xs:annotation>
          <xs:documentation>Specifies the maximum size of a packet to be returned by the ZIS. The ZIS may return packets smaller than, or equal to, the maximum value.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="SIF_Mode">
        <xs:annotation>
          <xs:documentation>Specifies the communication mode (Pull or Push) as chosen by the message sender.</xs:documentation>
        </xs:annotation>
        <xs:simpleType>
          <xs:restriction base="xs:token">
            <xs:enumeration value="Push" />
            <xs:enumeration value="Pull" />
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:element ref="sif:SIF_Protocol" minOccurs="0" />
      <xs:element name="SIF_NodeVendor" minOccurs="0">
        <xs:simpleType>
          <xs:restriction base="xs:normalizedString">
            <xs:annotation>
              <xs:documentation>The vendor of the SIF agent.</xs:documentation>
            </xs:annotation>
            <xs:maxLength value="256" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:element name="SIF_NodeVersion" minOccurs="0">
        <xs:simpleType>
          <xs:restriction base="xs:normalizedString">
            <xs:annotation>
              <xs:documentation>The agent version number.  The format of this field is undefined, but it should
						match the format used in the agent's conformance statement, if the agent is SIF Certified.</xs:documentation>
            </xs:annotation>
            <xs:maxLength value="32" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:element name="SIF_Application" minOccurs="0">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_Vendor">
              <xs:simpleType>
                <xs:restriction base="xs:normalizedString">
                  <xs:annotation>
                    <xs:documentation>The name of the company of the product that this agent supports.</xs:documentation>
                  </xs:annotation>
                  <xs:maxLength value="256" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
                </xs:restriction>
              </xs:simpleType>
            </xs:element>
            <xs:element name="SIF_Product">
              <xs:simpleType>
                <xs:restriction base="xs:normalizedString">
                  <xs:annotation>
                    <xs:documentation>The name of the product that this agent supports.</xs:documentation>
                  </xs:annotation>
                  <xs:maxLength value="256" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
                </xs:restriction>
              </xs:simpleType>
            </xs:element>
            <xs:element name="SIF_Version">
              <xs:simpleType>
                <xs:restriction base="xs:normalizedString">
                  <xs:annotation>
                    <xs:documentation>The version of the product. This field is informative only.</xs:documentation>
                  </xs:annotation>
                  <xs:maxLength value="32" xmlns:xs="http://www.w3.org/2001/XMLSchema" />
                </xs:restriction>
              </xs:simpleType>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="SIF_Icon" minOccurs="0" type="xs:anyURI">
        <xs:annotation>
          <xs:documentation>HTTP URL referencing an icon for graphical representation of the application/agent.
Should range from 16x16 pixels to 128x128 pixels and be of an image MIME type commonly supported by Web browsers (e.g. PNG, JPEG, GIF).  
Agents may optionally follow the more restrictive guidelines at [FAVICON].</xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Register" type="sif:SIF_RegisterType" />

  <xs:complexType name="SIF_RequestType">
    <xs:annotation>
      <xs:documentation>SIF_Request is used to request information in SIF data objects from other SIF nodes.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref="sif:SIF_Header" />
      <xs:element name="SIF_Version" maxOccurs="unbounded" type="sif:VersionWithWildcardsType">
        <xs:annotation>
          <xs:documentation>Specifies which SIF Implementation Specification version should be used when returning the response data; wildcards are allowed.
						The responding agent SHOULD return data using the highest version it supports 
						that falls within the specified versions.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="SIF_MaxBufferSize" type="xs:unsignedInt">
        <xs:annotation>
          <xs:documentation>Specifies the maximum size of a response packet to be returned to the requester. 
The responder may return packets smaller than, or equal to, the maximum value. 
To guarantee delivery of response packets, requesting agents must not specify a SIF_MaxBufferSize greater than its registered SIF_Register/SIF_MaxBufferSize.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:choice>
        <xs:element ref="sif:SIF_Query" />
        <xs:element ref="sif:SIF_ExtendedQuery" />
      </xs:choice>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Request" type="sif:SIF_RequestType" />

  <xs:complexType name="SIF_ResponseType">
    <xs:annotation>
      <xs:documentation>SIF_Response is used to respond to a SIF_Request message.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref="sif:SIF_Header" />
      <xs:element name="SIF_RequestMsgId" type="sif:MsgIdType">
        <xs:annotation>
          <xs:documentation>This is the message ID of the SIF_Request message being processed. It provides a unique match between a SIF_Response and a previous SIF_Request. Since the ID of each message from an agent is unique, the receiver of a SIF_Response message will be able to relate the SIF_Response to a SIF_Request that it sent out previously.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="SIF_PacketNumber" type="xs:positiveInteger">
        <xs:annotation>
          <xs:documentation>This element represents the index of the SIF_Response message in the sequence of packets that make up a complete response. Its value must be in the range of 1 through n, with n equal to the total number of packets that make up a response.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="SIF_MorePackets">
        <xs:annotation>
          <xs:documentation>This element provides an indication as to whether there are more packets besides this one to make up a complete response.</xs:documentation>
        </xs:annotation>
        <xs:simpleType>
          <xs:restriction base="xs:token">
            <xs:enumeration value="Yes" />
            <xs:enumeration value="No" />
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:choice>
        <xs:element ref="sif:SIF_Error" />
        <xs:element name="SIF_ObjectData" type="sif:SIF_ResponseObjectsType">
          <xs:annotation>
            <xs:documentation>The SIF_ObjectData element contains the data objects matching the supplied criteria in the SIF_Request message if the
						SIF_Request contained SIF_Query.  If the SIF_Request contained SIF_ExtendedQuery, include SIF_ExtendedQueryResults.</xs:documentation>
          </xs:annotation>
        </xs:element>
        <xs:element ref="sif:SIF_ExtendedQueryResults" />
      </xs:choice>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Response" type="sif:SIF_ResponseType" />

  <xs:complexType name="SIF_SubscribeType">
    <xs:annotation>
      <xs:documentation>This message is used to subscribe to event objects that are contained in this message.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref="sif:SIF_Header" />
      <xs:element name="SIF_Object" maxOccurs="unbounded">
        <xs:complexType>
          <xs:sequence>
            <xs:element ref="sif:SIF_Contexts" minOccurs="0" />
          </xs:sequence>
          <xs:attribute name="ObjectName" use="required" type="sif:SIF_SubscribeObjectNamesType">
            <xs:annotation>
              <xs:documentation>The actual name of the object that is being subscribed to. All valid SIF_Events for this object will be routed to the subscriber.</xs:documentation>
            </xs:annotation>
          </xs:attribute>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Subscribe" type="sif:SIF_SubscribeType" />

  <xs:complexType name="SIF_SystemControlType">
    <xs:annotation>
      <xs:documentation>This message is designed to control the flow of data an agent and ZIS or vice-versa, and to synchronously
retrieve data available from the ZIS.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref="sif:SIF_Header" />
      <xs:element name="SIF_SystemControlData">
        <xs:annotation>
          <xs:documentation>This element holds the sub-message being sent.</xs:documentation>
        </xs:annotation>
        <xs:complexType>
          <xs:choice>
            <xs:element ref="sif:SIF_Ping" />
            <xs:element ref="sif:SIF_Sleep" />
            <xs:element ref="sif:SIF_Wakeup" />
            <xs:element ref="sif:SIF_GetMessage" />
            <xs:element ref="sif:SIF_GetZoneStatus" />
            <xs:element ref="sif:SIF_GetAgentACL" />
            <xs:element ref="sif:SIF_CancelRequests" />
          </xs:choice>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_SystemControl" type="sif:SIF_SystemControlType" />

  <xs:complexType name="SIF_PingType">
    <xs:annotation>
      <xs:documentation>This sub-message detects if an a Push-Mode Agent or ZIS is ready to receive and process messages.</xs:documentation>
    </xs:annotation>
  </xs:complexType>

  <xs:element name="SIF_Ping" type="sif:SIF_PingType" />

  <xs:complexType name="SIF_SleepType">
    <xs:annotation>
      <xs:documentation>This sub-message tells a receiver not to send any more messages to the sender.</xs:documentation>
    </xs:annotation>
  </xs:complexType>

  <xs:element name="SIF_Sleep" type="sif:SIF_SleepType" />

  <xs:complexType name="SIF_WakeupType">
    <xs:annotation>
      <xs:documentation>This message tells a receiver that the sender is able to process messages.</xs:documentation>
    </xs:annotation>
  </xs:complexType>

  <xs:element name="SIF_Wakeup" type="sif:SIF_WakeupType" />

  <xs:complexType name="SIF_GetMessageType">
    <xs:annotation>
      <xs:documentation>This message tells the ZIS to return the first available message to the agent, subject to Selective Message Blocking.</xs:documentation>
    </xs:annotation>
  </xs:complexType>

  <xs:element name="SIF_GetMessage" type="sif:SIF_GetMessageType" />

  <xs:complexType name="SIF_GetZoneStatusType">
    <xs:annotation>
      <xs:documentation>This message tells the ZIS to return the current SIF_ZoneStatus in a SIF_Ack.</xs:documentation>
    </xs:annotation>
  </xs:complexType>

  <xs:element name="SIF_GetZoneStatus" type="sif:SIF_GetZoneStatusType" />

  <xs:complexType name="SIF_GetAgentACLType">
    <xs:annotation>
      <xs:documentation>This message tells the ZIS to return the Agent's ACL permissions in a SIF_Ack.</xs:documentation>
    </xs:annotation>
  </xs:complexType>

  <xs:element name="SIF_GetAgentACL" type="sif:SIF_GetAgentACLType" />

  <xs:complexType name="SIF_CancelRequestsType">
    <xs:annotation>
      <xs:documentation>This sub-message asks a receiver (ZIS or Push-Mode Agent) to cancel the specified SIF_Requests, pending or in process.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="SIF_NotificationType">
        <xs:simpleType>
          <xs:restriction base="xs:token">
            <xs:enumeration value="Standard">
              <xs:annotation>
                <xs:documentation>ZIS will send a "final" SIF_Response for each cancelled SIF_Request.</xs:documentation>
              </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="None">
              <xs:annotation>
                <xs:documentation>No further SIF_Responses for these requests will be placed in the Agent's queue.</xs:documentation>
              </xs:annotation>
            </xs:enumeration>
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:element name="SIF_RequestMsgIds">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="SIF_RequestMsgId" maxOccurs="unbounded" type="sif:MsgIdType">
              <xs:annotation>
                <xs:documentation>This is the </xs:documentation>
              </xs:annotation>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_CancelRequests" type="sif:SIF_CancelRequestsType" />

  <xs:complexType name="SIF_UnprovideType">
    <xs:annotation>
      <xs:documentation>This message performs the opposite function of SIF_Provide.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref="sif:SIF_Header" />
      <xs:element name="SIF_Object" maxOccurs="unbounded">
        <xs:complexType>
          <xs:sequence>
            <xs:element ref="sif:SIF_Contexts" minOccurs="0" />
          </xs:sequence>
          <xs:attribute name="ObjectName" use="required" type="sif:SIF_ProvideObjectNamesType">
            <xs:annotation>
              <xs:documentation>The actual name of the object that is being removed.</xs:documentation>
            </xs:annotation>
          </xs:attribute>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Unprovide" type="sif:SIF_UnprovideType" />

  <xs:complexType name="SIF_UnregisterType">
    <xs:annotation>
      <xs:documentation>This message is used to unregister an agent from a Zone.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref="sif:SIF_Header" />
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Unregister" type="sif:SIF_UnregisterType" />

  <xs:complexType name="SIF_UnsubscribeType">
    <xs:annotation>
      <xs:documentation>This message is used to unsubscribe from SIF_Events.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element ref="sif:SIF_Header" />
      <xs:element name="SIF_Object" maxOccurs="unbounded">
        <xs:complexType>
          <xs:sequence>
            <xs:element ref="sif:SIF_Contexts" minOccurs="0" />
          </xs:sequence>
          <xs:attribute name="ObjectName" use="required" type="sif:SIF_SubscribeObjectNamesType">
            <xs:annotation>
              <xs:documentation>The actual name of the object from which the agent should be unsubscribed. Events pertaining to this object published after successful unsubscription will no longer be queued for delivery to the agent. Events already queued for delivery to the agent prior to unsubscription will be delivered.</xs:documentation>
            </xs:annotation>
          </xs:attribute>
        </xs:complexType>
      </xs:element>
    </xs:sequence>
  </xs:complexType>

  <xs:element name="SIF_Unsubscribe" type="sif:SIF_UnsubscribeType" />

</xs:schema>