<xs:schema xmlns="http://ltsc.ieee.org/xsd/LOM" xmlns:ag="http://ltsc.ieee.org/xsd/LOM/unique" xmlns:ex="http://ltsc.ieee.org/xsd/LOM/extend" xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="http://ltsc.ieee.org/xsd/LOM" elementFormDefault="qualified" version="IEEE LTSC LOM XML 1.0">
	<xs:annotation>
		<xs:documentation>
         This work is licensed under the Creative Commons Attribution-ShareAlike
         License.  To view a copy of this license, see the file license.txt,
         visit http://creativecommons.org/licenses/by-sa/1.0 or send a letter to
         Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
      </xs:documentation>
		<xs:documentation>
         This component schema provides global type declarations for LOM datatypes.
      </xs:documentation>
		<xs:documentation>
        ****************************************************************************
        **                           CHANGE HISTORY                               **
        ****************************************************************************
        ** 11/14/2003:  1)Updated xs:pattern for the DurationString.  The pattern **
        **                did not permit zero values for each of the date and     **
        **                time components.                                        **
        **                                                                        **
        ** 03/15/2004:  1)Changed the restriction type for LanguageIdNone from    **
        **                xs:string to xs:token                                   **
        ****************************************************************************
      </xs:documentation>
	</xs:annotation>
	<xs:import namespace="http://ltsc.ieee.org/xsd/LOM/unique" schemaLocation="../unique/strict.xsd"/>
	<xs:import namespace="http://ltsc.ieee.org/xsd/LOM/extend" schemaLocation="../extend/strict.xsd"/>
	<!-- Data type declarations -->
	<!-- CharacterString -->
	<xs:simpleType name="CharacterString">
		<xs:restriction base="xs:string"/>
	</xs:simpleType>
	<!-- LanguageId -->
	<xs:simpleType name="LanguageIdOrNone">
		<xs:union memberTypes="LanguageId LanguageIdNone"/>
	</xs:simpleType>
	<xs:simpleType name="LanguageId">
		<xs:restriction base="xs:language"/>
	</xs:simpleType>
	<xs:simpleType name="LanguageIdNone">
		<xs:restriction base="xs:token">
			<xs:enumeration value="none"/>
		</xs:restriction>
	</xs:simpleType>
	<!-- VCard -->
	<xs:simpleType name="VCard">
		<xs:restriction base="CharacterString"/>
	</xs:simpleType>
	<!-- MimeType -->
	<xs:simpleType name="MimeType">
		<xs:restriction base="CharacterString"/>
	</xs:simpleType>
	<!-- Size -->
	<xs:simpleType name="Size">
		<xs:restriction base="xs:nonNegativeInteger"/>
	</xs:simpleType>
	<!-- LangString -->
	<xs:complexType name="LangString">
		<xs:choice minOccurs="0" maxOccurs="unbounded">
			<xs:element name="string" type="langString"/>
			<xs:group ref="ex:customElements"/>
		</xs:choice>
	</xs:complexType>
	<xs:complexType name="langString">
		<xs:simpleContent>
			<xs:extension base="CharacterString">
				<xs:attribute name="language" type="LanguageId"/>
			</xs:extension>
		</xs:simpleContent>
	</xs:complexType>
	<!-- DateTime -->
	<xs:complexType name="DateTime">
		<xs:choice minOccurs="0" maxOccurs="unbounded">
			<xs:element name="dateTime" type="DateTimeValue"/>
			<xs:element name="description" type="description"/>
			<xs:group ref="ex:customElements"/>
		</xs:choice>
	</xs:complexType>
	<xs:complexType name="DateTimeValue">
		<xs:simpleContent>
			<xs:extension base="DateTimeString">
				<xs:attributeGroup ref="ag:DateTimeValue"/>
			</xs:extension>
		</xs:simpleContent>
	</xs:complexType>
	<!-- Regular expresion from Christian Klaue -->
	<xs:simpleType name="DateTimeString">
		<xs:restriction base="CharacterString">
			<xs:pattern value="([0-9]{3}[1-9]|[0-9]{2}[1-9][0-9]|[0-9][1-9][0-9]{2}|[1-9][0-9]{3})(\-(0[1-9]|1[0-2])(\-(0[1-9]|[1-2][0-9]|3[0-1])(T([0-1][0-9]|2[0-3])(:[0-5][0-9](:[0-5][0-9](\.[0-9]{1,}(Z|((\+|\-)([0-1][0-9]|2[0-3]):[0-5][0-9]))?)?)?)?)?)?)?"/>
		</xs:restriction>
	</xs:simpleType>
	<!-- Duration -->
	<xs:complexType name="Duration">
		<xs:choice minOccurs="0" maxOccurs="unbounded">
			<xs:element name="duration" type="DurationValue"/>
			<xs:element name="description" type="description"/>
			<xs:group ref="ex:customElements"/>
		</xs:choice>
	</xs:complexType>
	<xs:complexType name="DurationValue">
		<xs:simpleContent>
			<xs:extension base="DurationString">
				<xs:attributeGroup ref="ag:DurationValue"/>
			</xs:extension>
		</xs:simpleContent>
	</xs:complexType>
	<!-- Regular expresion from Christian Klaue -->
	<xs:simpleType name="DurationString">
		<xs:restriction base="CharacterString">
			<xs:pattern value="P([0-9]{1,}Y){0,1}([0-9]{1,}M){0,1}([0-9]{1,}D){0,1}(T([0-9]{1,}H){0,1}([0-9]{1,}M){0,1}([0-9]{1,}(\.[0-9]{1,}){0,1}S){0,1}){0,1}"/>
		</xs:restriction>
	</xs:simpleType>
</xs:schema>
