<xs:schema targetNamespace="http://ltsc.ieee.org/xsd/LOM"
           xmlns="http://ltsc.ieee.org/xsd/LOM"
           xmlns:xs="http://www.w3.org/2001/XMLSchema"
           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/2.0 or send a letter to
         Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
      </xs:documentation>
      <xs:documentation>
         This file represents a composite schema for validating
         LOM XML Instances.  This file is built by default to represent a 
         composite schema for validation of the following:          

         1) The use of LOMv1.0 base schema (i.e., 1484.12.1-2002) vocabulary
            source/value pairs only
         2) Uniqueness constraints defined by LOMv1.0 base schema
         3) No existenace of any defined extensions:
            LOMv1.0 base schema XML element extension,
            LOMv1.0 base schema XML attribute extension and 
            LOMv1.0 base schema vocabulary data type extension

         Alternative composite schemas can be assembled by selecting
         from the various alternative component schema listed below.
      </xs:documentation>
      <xs:documentation>
        *****************************************************************************
        **                                                                         ** 
        ** NOTE THIS CHANGE HISTORY IS USED TO DOCUMENT CHANGES TO THE XML SCHEMA  **
        ** DEFINITION DURING THE BALLOTING PROCESS.  THIS CHANGE HISTORY WILL BE   **
        ** REMOVED ONCE THE FINAL VERSION OF THE STANDARD IS PUBLISHED.  A NEW     **
        ** CHANGE HISTORY WILL BE INCLUDED TO INDICATE THE INITIAL RELEASE THAT    **
        ** MAPS TO THE FINAL STANDARD.                                             **
        **                                                                         **
        *****************************************************************************
        **                            CHANGE HISTORY                               **
        *****************************************************************************
        ** 11/14/2003:  1)Updated comment describing vocab/strict.xsd.  Indicated  **
        **                that the strict.xsd is used to validate vocabularies     **
        **                defined in the LOM V1.0 Base Schema.                     **
        **              2)Moved included schema elementNames.xsd just before       **
        **                elementTypes.xsd.                                        **
        **              3)Moved the element declaration for the top-level lom      **
        **                metadata element to a separate file (rootElement.xsd)    **
        **                and included this file just after elementTypes.xsd.      **
        **              4)Moved the XML Schema import statements before the XML    **
        **                Schema include statements.                               **
        **              5)Moved the element group declaration named                **
        **                lom:customElements to a separate file (anyElement.xsd)   **
        **                and included this new file just before the XML Schema    **
        **                import statments.                                        **
        **                                                                         **
        ** 03/15/2004:  1)Switched which vocabulary vaidation approach is the      **
        **                default to be used by this template from vocab/loose.xsd **
        **                to vocab/strict.xsd.  Base on ballot resolution comment  **
        **                addressed on 03/15/2004                                  **
        **              2)Switched the extension validation approach to use        **
        **                extend/strict.xsd.  The XSD now is reprsentative of      **
        **                a schema that can be used to validate strictly           **
        **                conforming LOM XML Instances.                            **
        ** 09/27/2004   1)Updated file documentation to correspond with working    **
        **                draft 3.                                                 **
        **              2)Updated the Creative Commons Licensing agreement to      **
        **                reference the Attribution-ShareAlike 2.0                 **
        *****************************************************************************
      </xs:documentation>
   </xs:annotation>

   <!-- Learning Object Metadata -->

   <xs:include schemaLocation="common/anyElement.xsd"/>

   <!-- LOM data element uniqueness constraints:  use one of the following         -->
   <!-- Use unique/loose.xsd to relax element uniqueness constraints               -->
   <!-- Use unique/strict.xsd to enforce element uniqueness constraints            -->

   <!-- <xs:import namespace="http://ltsc.ieee.org/xsd/LOM/unique"
              schemaLocation="unique/loose.xsd"/> -->

   <xs:import namespace="http://ltsc.ieee.org/xsd/LOM/unique"
              schemaLocation="unique/strict.xsd"/>

   <!-- Vocabulary value validation:  use one of the following                     -->
   <!-- Use vocab/loose.xsd to relax vocabulary value constraints                  -->
   <!-- Use vocab/strict.xsd to enforce the LOMv1.0 base schema vocabulary values  -->
   <!-- Use vocab/custom.xsd to enforce custom vocabulary values                   -->

   <!--<xs:import namespace="http://ltsc.ieee.org/xsd/LOM/vocab"
              schemaLocation="vocab/loose.xsd"/> -->

   <xs:import namespace="http://ltsc.ieee.org/xsd/LOM/vocab"
              schemaLocation="vocab/strict.xsd"/> 

   <!-- <xs:import namespace="http://ltsc.ieee.org/xsd/LOM/vocab"
              schemaLocation="vocab/custom.xsd"/> -->

   <!-- Extension elements/attributes support:  use one of the following           -->
   <!-- Use extend/strict.xsd to enforce no element/attribute extension            -->
   <!-- Use extend/custom.xsd to allow element/attribute extension                 -->

   <xs:import namespace="http://ltsc.ieee.org/xsd/LOM/extend"
             schemaLocation="extend/strict.xsd"/>  

   <!--<xs:import namespace="http://ltsc.ieee.org/xsd/LOM/extend"
              schemaLocation="extend/custom.xsd"/> -->

   <xs:include schemaLocation="common/dataTypes.xsd"/>
   <xs:include schemaLocation="common/elementNames.xsd"/>
   <xs:include schemaLocation="common/elementTypes.xsd"/>
   <xs:include schemaLocation="common/rootElement.xsd"/>
   <xs:include schemaLocation="common/vocabValues.xsd"/>
   <xs:include schemaLocation="common/vocabTypes.xsd"/>

</xs:schema>