<xs:schema targetNamespace="http://www.imsglobal.org/xsd/imsld_v1p0" xmlns="http://www.imsglobal.org/xsd/imsld_v1p0" xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified" version="IMS LD Level B version 1.0 Final Draft">
	<!--
		IPR, License and Distribution Notices
		This machine readable file is derived from IMS specification IMS Learning Design XML Binding Version 1.0 Final Specification 
		found at http://www.imsglobal.org/learningdesign/ and the original IMS schema binding or code base 
		http://www.imsglobal.org/learningdesign/ldv1p0/imsld_bindv1p0.html.
		
		Recipients of this document are requested to submit, with their comments, notification of any relevant patent 
		claims or other intellectual property rights of which they may be aware that might be infringed by the schema 
		binding contained in this document.
		
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		claimed to pertain to the implementation or use of the technology described in this document or the extent to 
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		can be found at the IMS Intellectual Property Rights web page: http://www.imsglobal.org/ipr/imsipr_policyFinal.pdf.
		
		Copyright © IMS Global Learning Consortium 1999-2007. All Rights Reserved.
		
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		non-exclusive license to use this document.
		
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		display and distribute the contents of this document in any medium for any purpose without fee or royalty provided 
		that you include this IPR, License and Distribution notice in its entirety on ALL copies, or portions thereof, that you 
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		The limited permissions granted above are perpetual and will not be revoked by IMS or its successors or assigns.
		
		THIS SPECIFICATION IS BEING OFFERED WITHOUT ANY WARRANTY WHATSOEVER, AND IN PARTICULAR, 
		ANY WARRANTY OF NONINFRINGEMENT IS EXPRESSLY DISCLAIMED. ANY USE OF THIS SPECIFICATION 
		SHALL BE MADE ENTIRELY AT THE IMPLEMENTER’S OWN RISK, AND NEITHER THE CONSORTIUM, NOR 
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	-->
	<xs:annotation>
		<xs:documentation>This module contains the elements that constitute the expression schema that is used in IMS LD. 
		The module must be included in level B of the IMS LD specifications.
		This module can not be used independently, because it makes use of several IMS LD elements and attributes.
		Changed the namespace.
		</xs:documentation>
	</xs:annotation>
	
	<!-- ******************** -->
	<!-- ** Change History ** -->
	<!-- ******************** -->
	<xs:annotation>
		<xs:documentation>4 November 2002
		Created module.
		</xs:documentation>
	</xs:annotation>
	
	<!-- ***************************** -->
	<!-- **Re-usable content models ** -->
	<!-- ***************************** -->
	<xs:group name="grp.operand">
		<xs:annotation>
			<xs:documentation xml:lang="en">This model consists of the operands used in the expression.</xs:documentation>
		</xs:annotation>
		<xs:choice>
			<xs:element ref="property-ref"/>
			<xs:element ref="property-value"/>
			<xs:group ref="grp.expression"/>
		</xs:choice>
	</xs:group>
	<xs:group name="grp.calculate">
		<xs:annotation>
			<xs:documentation xml:lang="en">This model consists of the operands and expressions used in the expression. This model is used in several elements.</xs:documentation>
		</xs:annotation>
		<xs:sequence>
			<xs:group ref="grp.operand" minOccurs="2" maxOccurs="2"/>
		</xs:sequence>
	</xs:group>
	<xs:group name="grp.expression">
		<xs:annotation>
			<xs:documentation xml:lang="en">This model consists of operator elements that can be used to build expressions. This model is used in several elements.</xs:documentation>
		</xs:annotation>
		<xs:choice>
			<xs:element ref="is-member-of-role"/>
			<xs:element ref="is"/>
			<xs:element ref="is-not"/>
			<xs:element ref="and"/>
			<xs:element ref="or"/>
			<xs:element ref="sum"/>
			<xs:element ref="subtract"/>
			<xs:element ref="multiply"/>
			<xs:element ref="divide"/>
			<xs:element ref="greater-than"/>
			<xs:element ref="less-than"/>
			<xs:element ref="users-in-role"/>
			<xs:element ref="no-value"/>
			<xs:element ref="time-unit-of-learning-started"/>
			<xs:element ref="datetime-activity-started"/>
			<xs:element ref="current-datetime"/>
			<xs:element ref="complete"/>
			<xs:element ref="not"/>
		</xs:choice>
	</xs:group>
	
	<!-- ************************** -->
	<!-- ** Element declarations ** -->
	<!-- ************************** -->
	<xs:element name="is" type="calculateType"/>
	<xs:element name="is-not" type="calculateType"/>
	<xs:element name="and" type="operatorType"/>
	<xs:element name="or" type="operatorType"/>
	<xs:element name="sum" type="sumType"/>
	<xs:element name="subtract" type="calculateType"/>
	<xs:element name="multiply" type="calculateType"/>
	<xs:element name="divide" type="calculateType"/>
	<xs:element name="greater-than" type="calculateType"/>
	<xs:element name="less-than" type="calculateType"/>
	<xs:element name="users-in-role" type="users-in-roleType"/>
	<xs:element name="no-value" type="no-valueType"/>
	<xs:element name="complete" type="completeType"/>
	<xs:element name="not" type="expressionType"/>

	<!-- *********** -->
	<!-- ** Empty ** -->
	<!-- *********** -->
	<xs:element name="current-datetime">
		<xs:annotation>
			<xs:documentation xml:lang="en">This refers to a system variable when implementing IMS LD. The system should return a variable of type dateTime, holding the current date and time.</xs:documentation>
			<xs:appinfo>Return a variable of type dateTime.</xs:appinfo>
		</xs:annotation>
		<xs:complexType/>
	</xs:element>
	
	<!-- *************************** -->
	<!-- ** Empty with attributes ** -->
	<!-- *************************** -->
	<xs:element name="is-member-of-role">
		<xs:complexType>
			<xs:attributeGroup ref="attr.ref.req"/>
		</xs:complexType>
	</xs:element>
	<xs:element name="time-unit-of-learning-started">
		<xs:annotation>
			<xs:documentation xml:lang="en">This refers to a system variable when implementing IMS LD. The system should return a variable of type dateTime.</xs:documentation>
			<xs:appinfo>Return a variable of type dateTime</xs:appinfo>
		</xs:annotation>
		<xs:complexType>
			<xs:attribute name="unit-of-learning-uri" type="xs:anyURI" use="required"/>
		</xs:complexType>
	</xs:element>
	<xs:element name="datetime-activity-started">
		<xs:annotation>
			<xs:documentation xml:lang="en">This refers to a system variable when implementing IMS LD. The system should return a variable of type dateTime.</xs:documentation>
			<xs:appinfo>Return a variable of type dateTime</xs:appinfo>
		</xs:annotation>
		<xs:complexType>
			<xs:attributeGroup ref="attr.ref.req"/>
		</xs:complexType>
	</xs:element>
	<xs:element name="role-part-ref">
		<xs:complexType>
			<xs:attributeGroup ref="attr.ref.req"/>
		</xs:complexType>
	</xs:element>
	<xs:element name="act-ref">
		<xs:complexType>
			<xs:attributeGroup ref="attr.ref.req"/>
		</xs:complexType>
	</xs:element>
	
	<!-- ******************* -->
	<!-- ** Complex types ** -->
	<!-- ******************* -->
	<xs:complexType name="calculateType">
		<xs:group ref="grp.calculate"/>
	</xs:complexType>
	<xs:complexType name="expressionType">
		<xs:group ref="grp.expression"/>
	</xs:complexType>
	<xs:complexType name="operatorType">
		<xs:annotation>
			<xs:documentation xml:lang="en">This model is used in the elements 'and' and 'or'.</xs:documentation>
		</xs:annotation>
		<xs:sequence>
			<xs:group ref="grp.expression" minOccurs="2" maxOccurs="unbounded"/>
		</xs:sequence>
	</xs:complexType>
	<xs:complexType name="sumType">
		<xs:group ref="grp.calculate" maxOccurs="unbounded"/>
	</xs:complexType>
	<xs:complexType name="users-in-roleType">
		<xs:sequence>
			<xs:element ref="role-ref"/>
			<xs:element ref="expression"/>
		</xs:sequence>
	</xs:complexType>
	<xs:complexType name="no-valueType">
		<xs:sequence>
			<xs:element ref="property-ref"/>
		</xs:sequence>
	</xs:complexType>
	<xs:complexType name="completeType">
		<xs:choice>
			<xs:element ref="learning-activity-ref"/>
			<xs:element ref="support-activity-ref"/>
			<xs:element ref="unit-of-learning-href"/>
			<xs:element ref="activity-structure-ref"/>
			<xs:element ref="role-part-ref"/>
			<xs:element ref="act-ref"/>
			<xs:element ref="play-ref"/>
		</xs:choice>
	</xs:complexType>
</xs:schema>