<?xml version='1.0'?>
<xs:schema 
	targetNamespace="http://wijis.wisconsin.gov/specs/schemas/message/v1.0/2006-05-25/"
	xmlns='http://wijis.wisconsin.gov/specs/schemas/message/v1.0/2006-05-25/'
	xmlns:wij-uri='http://wijis.wisconsin.gov/specs/schemas/uri/v1.0/2006-05-25/'
	xmlns:wij-util='http://wijis.wisconsin.gov/specs/schemas/util/v1.0/2006-05-25/'
	xmlns:svc='http://wijis.wisconsin.gov/specs/schemas/service/v1.0/2006-05-25/'
	xmlns:xs="http://www.w3.org/2001/XMLSchema" 
	elementFormDefault="qualified" 
	attributeFormDefault="unqualified"
>

	<!-- wij-uri -->
	<xs:import 
		namespace='http://wijis.wisconsin.gov/specs/schemas/uri/v1.0/2006-05-25/' 
		schemaLocation='http://wijiscommons.org/specs/schemas/uri/v1.0/2006-05-25/WijisURI.xsd'
	>
		<xs:annotation>
			<xs:documentation>The WIJIS URI Schema.</xs:documentation>
		</xs:annotation>
	</xs:import>

	<!-- wij-util -->
	<xs:import 
		namespace='http://wijis.wisconsin.gov/specs/schemas/util/v1.0/2006-05-25/' 
		schemaLocation='http://wijiscommons.org/specs/schemas/util/v1.0/2006-05-25/WijisUtil.xsd'
	>
		<xs:annotation>
			<xs:documentation>The WIJIS General Utility Schema.</xs:documentation>
		</xs:annotation>
	</xs:import>

	<!-- svc -->
	<xs:import
		namespace='http://wijis.wisconsin.gov/specs/schemas/service/v1.0/2006-05-25/' 
		schemaLocation='http://wijiscommons.org/specs/schemas/service/v1.0/2006-05-25/WijisService.xsd'
	>
		<xs:annotation>
			<xs:documentation>The WIJIS Service Schema, containing components supporting WIJIS services in general.</xs:documentation>
		</xs:annotation>
	</xs:import>




	<!-- Purpose of this schema
		 ======================
		To provide datatype definitions and element declarations that 
		can be used for definition of WIJIS message envelopes.
		
		Definitions and declarations from this schema are NOT used to
		structure the *data content* of a message; only to govern or
		describe its transmission or handling. This schema does address
		certain types of metadata.
	-->
	
		<!-- 
		msg:trackingInfo content:
		
		Conversation Tracking Information
		=================================
		A mechanism for permitting message conversations (or, 
		equivalently, workflow) to branch. 
		
			- "branchStack" is a string of the form n/(n/)* where "n" is the string
				representation of a nonnegative integer and "/" is literal. (In
				other words: a nested path of number-named elements.) 

			- "convSeq" is the dense, zero-based  counter of conversational 
				message exchange direction and sequence:
				
				0: initial Request
				
				1: Response to Initial Request
				
				2: Subsequent Request triggered by receipt
				
				n: etc.
		
		Taken together, msg:branchStack/msg:convSeq defines a location on an
		acyclic node tree structure.
		
		-->
	<xs:complexType name='WijisMessageTrackingInfoType'>
		<xs:annotation>
			<xs:documentation>
				The seven attributes contained in this type (five in the 
				serviceInvocationIdentifier group, and two individually defined)
				are sufficient to uniquely identify any message transmission 
				within the WIJIS Service space; they also maintain awareness of
				the original service invocation that started the
				conversation of which the message is a part.
			</xs:documentation>
		</xs:annotation>
		<xs:attributeGroup ref='svc:serviceInvocationIdentifier' />
		<xs:attribute ref='convSeq' use='required' />
		<xs:attribute ref='branchStack' use='required' />
		<xs:attributeGroup ref='svc:currentInvocationInfo' />
	</xs:complexType>
	
	<xs:attribute name='branchStack' type='wij-util:SlashDelimitedIntegerSeqType' />
	<xs:attribute name='convSeq' type='xs:nonNegativeInteger' />
	
	<xs:element name='messageTrackingInfo' type='WijisMessageTrackingInfoType' />
	
<!--
		FOR YOUR CONVENIENCE:
		Here's what the attribute declarations in WijisMessageTrackingInfoType
		would look like if they were all flattened out into individual
		attribute references, rather than structured by nested attributeGroup 
		declarations:
		
		[informally: 
			wij-uri is WijisURI.xsd;
			svc is WijisService.xsd;
			msg is WijisMessage.xsd (i.e. this schema.)]
		
		
		<xs:attribute ref='wij-uri:serviceDefURI' use='required' />
		<xs:attribute ref='svc:serviceProviderURI' use='required' />
		<xs:attribute ref='svc:serviceLabel' use='optional' />
		<xs:attribute ref='svc:serviceRequesterURI' use='required' />
		<xs:attribute ref='svc:requesterInvocationNum' use='optional' />
		<xs:attribute ref='svc:serviceInvocationNum' use='required' />
		<xs:attribute ref='msg:convSeq' use='required' />
		<xs:attribute ref='msg:branchStack' use='required' />
		
		and, these attributes introduced with 2006-05-25 relese:
		<xs:attribute ref='svc:initialUserURI' use='optional' />
		<xs:attribute ref='svc:currentServiceDefURI' use='required' />
		<xs:attribute ref='svc:currentServiceProviderURI' use='required' />
		<xs:attribute ref='svc:currentServiceLabel' use='required' />
		<xs:attribute ref='svc:currentSendingOperatorURI' use='required' />
		<xs:attribute ref='svc:adHocUserURI' use='optional' />
-->

</xs:schema>