<?xml version="1.0" encoding="UTF-8"?>
<!-- ============================================================= -->
<!--                    HEADER                                     -->
<!-- ============================================================= -->
<!--  MODULE:    DITA Metadata                                     -->
<!--  VERSION:   1.1                                             -->
<!--  DATE:      November 2006                                     -->
<!--                                                               -->
<!-- ============================================================= -->

<!-- ============================================================= -->
<!-- SYSTEM:     Darwin Information Typing Architecture (DITA)     -->
<!--                                                               -->
<!-- PURPOSE:    Declaring the elements and specialization         -->
<!--             attributes for the DITA XML Metadata              -->
<!--                                                               -->
<!-- ORIGINAL CREATION DATE:                                       -->
<!--             March 2001                                        -->
<!--                                                               -->
<!--             (C) Copyright OASIS-Open.org 2005, 2006                -->
<!--             (C) Copyright IBM Corporation 2001, 2004.         -->
<!--             All Rights Reserved.                              -->
<!-- ============================================================= -->

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">

  
  <xs:element name="author">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>author</keyword>> metadata element contains the
        name of the topic's author. The currently unsupported keyref attribute can
        point to another location where the author information is defined.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType  mixed="true">
      <xs:complexContent>
        <xs:extension base="author.class">
          <xs:attribute ref="class" default="- topic/author "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="author.class" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="words.cnt"/>
    </xs:choice>
    <xs:attribute name="href" type="xs:string"/>
    <xs:attribute name="keyref" type="xs:string"/>
    <xs:attribute name="type" type="author-type-atts.class"/>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  <xs:simpleType name="author-type-atts.class">
    <xs:restriction base="xs:string">
      <xs:enumeration value="creator"/>
      <xs:enumeration value="contributor"/>
      <xs:enumeration value="-dita-use-conref-target"/>
    </xs:restriction>
  </xs:simpleType>

  
  <xs:element name="source">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>source</keyword>> element contains a reference
        to a resource from which the present topic is derived, either completely or
        in part. The element can contain a description of the resource; the <keyword>href</keyword> reference
        can be a string or a URL that points to it.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
      <xs:complexContent>
        <xs:extension base="source.class">
          <xs:attribute ref="class" default="- topic/source "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="source.class" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="words.cnt"/>
    </xs:choice>
    <xs:attribute name="href" type="xs:string" />
    <xs:attribute name="keyref" type="xs:string"/>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  
  <xs:element name="publisher">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>publisher</keyword>> metadata element contains
        the name of the person, company, or organization responsible for making the
        content or subject of the topic available.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
      <xs:complexContent>
        <xs:extension base="publisher.class">
          <xs:attribute ref="class" default="- topic/publisher "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="publisher.class" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="words.cnt"/>
    </xs:choice>
    <xs:attribute name="href" type="xs:string" />
    <xs:attribute name="keyref" type="xs:string"/>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  
  <xs:element name="copyright">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>copyright</keyword>> element is used for a single
        copyright entry. It includes the copyright years and the copyright holder.
        Multiple &lt;<keyword>copyright</keyword>> statements are allowed.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="copyright.class">
          <xs:attribute ref="class" default="- topic/copyright "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="copyright.class">
    <xs:sequence>
      <xs:group ref="copyryear" maxOccurs="unbounded"/>
      <xs:group ref="copyrholder"/>
    </xs:sequence>
    <xs:attribute name="type" type="copyright-type-att.class"/>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  <xs:simpleType name="copyright-type-att.class">
    <xs:restriction base="xs:string">
      <xs:enumeration value="primary"/>
      <xs:enumeration value="secondary"/>
      <xs:enumeration value="-dita-use-conref-target"/>
    </xs:restriction>
  </xs:simpleType>

  
  <xs:element name="copyryear">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>copyryear</keyword>> element contains the copyright
        year as specified by the <keyword>year</keyword> attribute.   
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="copyryear.class">
          <xs:attribute ref="class" default="- topic/copyryear "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="copyryear.class">
    <xs:attribute name="year" type="xs:gYear" use="required"/>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  
  <xs:element name="copyrholder">
    <xs:annotation>
      <xs:documentation>The copyright holder (&lt;<keyword>copyrholder</keyword>>) element
        names the entity that holds legal rights to the material contained in the
        topic.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
      <xs:complexContent>
        <xs:extension base="copyrholder.class">
          <xs:attribute ref="class" default="- topic/copyrholder "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="copyrholder.class" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="words.cnt"/>
    </xs:choice>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  
  <xs:element name="critdates">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>critdates</keyword>> element contains the critical
        dates in a document life cycle, such as the creation date and multiple revision
        dates.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="critdates.class">
          <xs:attribute ref="class" default="- topic/critdates "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="critdates.class">
    <xs:sequence>
      <xs:group ref="created"/>
      <xs:group ref="revised" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  
  <xs:element name="revised">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>revised</keyword>> element in the prolog is used
        to maintain tracking dates that are important in a topic development cycle,
        such as the last modification date, the original availability date, and the
        expiration date.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="revised.class">
          <xs:attribute ref="class" default="- topic/revised "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="revised.class">
    <xs:attribute name="modified" type="xs:string" use="required"/>
    <xs:attribute name="golive" type="xs:string"/>
    <xs:attribute name="expiry" type="xs:string"/>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  
  <xs:element name="created">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>created</keyword>> element specifies the document
        creation date using the <keyword>date</keyword> attribute.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="created.class">
          <xs:attribute ref="class" default="- topic/created "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="created.class">
    <xs:attribute name="date" type="xs:string" use="required"/>
    <xs:attribute name="golive" type="xs:string"/>
    <xs:attribute name="expiry" type="xs:string"/>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  
  <xs:element name="resourceid">
    <xs:annotation>
      <xs:documentation> The &lt;<keyword>resourceid</keyword>> element provides an identifier
        for applications that require them in a particular format, when the normal
        id attribute of the topic can't be used. Each resourceid entry should be unique.
        It is one of the metadata elements that can be included within the prolog
        of a topic, along with document tracking and product information, etc. The
        element has no content, but takes an <keyword>id</keyword> attribute
        or an <keyword>appname</keyword> attribute.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="resourceid.class">
          <xs:attribute ref="class" default="- topic/resourceid "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="resourceid.class">
    <xs:attribute name="id" type="xs:string" use="required"/>
    <xs:attribute name="appname" type="xs:string"/>
    <xs:attribute name="conref" type="xs:string"/>
    <xs:attributeGroup ref="select-atts"/>
    <xs:attributeGroup ref="localization-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  
  <xs:element name="audience">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>audience</keyword>&gt; metadata element indicates,
        through the value of its type attribute, the intended audience for a topic.
        Since a topic can have multiple audiences, you can include multiple audience
        elements. For each audience you specify, you can identify the high-level task
        (<keyword>job</keyword>) they are trying to accomplish and the level
        of experience (<keyword>experiencelevel</keyword>) expected.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="audience.class">
          <xs:attribute ref="class" default="- topic/audience "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="audience.class">
    <xs:attribute name="type" type="audience-type-att.class"/>
    <xs:attribute name="othertype" type="xs:string"/>
    <xs:attribute name="job" type="job-att.class"/>
    <xs:attribute name="otherjob" type="xs:string"/>
    <xs:attribute name="experiencelevel" type="experiencelevel-att.class"/>
    <xs:attribute name="name" type="xs:NMTOKEN"/>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  
  <xs:element name="category">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>category</keyword>> element can represent any
        category by which a topic might be classified for retrieval or navigation;
        for example, the categories could be used to group topics in a generated navigation
        bar. Topics can belong to multiple categories.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
      <xs:complexContent>
        <xs:extension base="category.class">
          <xs:attribute ref="class" default="- topic/category "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="category.class" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="words.cnt"/>
    </xs:choice>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>



  <xs:element name="keywords">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>keywords</keyword>> element contains a list of
        keyword entries (using <ph><xref href="indexterm.xml">indexterm</xref></ph> or <ph><xref
          href="keyword.xml">keyword</xref></ph> markup) that can be used by a search
        engine. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="keywords.class">
          <xs:attribute ref="class" default="- topic/keywords "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="keywords.class">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="indexterm"/>
      <xs:group ref="keyword"/>
    </xs:choice>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>


  
  <xs:element name="othermeta">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>othermeta</keyword>> element can be used to identify
        properties not otherwise included in &lt;<keyword>metadata</keyword>> and
        assign  name/content values to those properties. The name attribute identifies
        the property and the content attribute specifies the property's value. The
        values in this attribute are output as HTML metadata elements, and have no
        defined meaning for other possible outputs such as PDF.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="othermeta.class">
          <xs:attribute ref="class" default="- topic/othermeta "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="othermeta.class">
    <xs:attribute name="name" type="xs:string" use="required"/>
    <xs:attribute name="content" type="xs:string" use="required"/>
    <xs:attribute name="translate-content" type="yesno-att.class"/>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  
  <xs:element name="permissions">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>permissions</keyword>> empty prolog element can
        indicate any preferred controls for access to a topic. Topics can be filtered
        based on the permissions element. This capability depends on your output formatting
        process.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="permissions.class">
          <xs:attribute ref="class" default="- topic/permissions "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="permissions.class">
    <xs:attribute name="view" type="view-att.class" use="required"/>
    <xs:attributeGroup ref="global-atts"/>
    <xs:attributeGroup ref="univ-atts"/>
  </xs:complexType>

  
  <xs:element name="prodinfo">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>prodinfo</keyword>> metadata element in the prolog
        contains information about the product or products that are the subject matter
        of the current topic.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="prodinfo.class">
          <xs:attribute ref="class" default="- topic/prodinfo "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="prodinfo.class">
    <xs:sequence>
      <xs:group ref="prodname"/>
      <xs:group ref="vrmlist"/>
      <xs:choice minOccurs="0" maxOccurs="unbounded">
        <xs:group ref="prodinfo.cnt"/>
      </xs:choice>
    </xs:sequence>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  
  <xs:element name="brand">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>brand</keyword>> element indicates the manufacturer
        or brand associated with the product described by the parent  <ph><xref href="prodinfo.xml">&lt;<keyword>prodinfo</keyword>></xref></ph> element.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
      <xs:complexContent>
        <xs:extension base="brand.class">
          <xs:attribute ref="class" default="- topic/brand "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="brand.class" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="words.cnt"/>
    </xs:choice>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  
  <xs:element name="series">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>series</keyword>> metadata element contains information
        about the product series that the topic supports.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
      <xs:complexContent>
        <xs:extension base="series.class">
          <xs:attribute ref="class" default="- topic/series "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="series.class" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="words.cnt"/>
    </xs:choice>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  
  <xs:element name="platform">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>platform</keyword>> metadata element contains
        a description of the operating system and/or hardware related to the product
        being described by the &lt;<keyword>prodinfo</keyword>> element.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
      <xs:complexContent>
        <xs:extension base="platform.class">
          <xs:attribute ref="class" default="- topic/platform "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="platform.class" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="words.cnt"/>
    </xs:choice>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>


  <xs:element name="prognum">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>prognum</keyword>> metadata element identifies
        the program number of the associated program product.  This is typically an
        order number or a product tracking code that could be replaced by an order
        number when a product completes development.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
      <xs:complexContent>
        <xs:extension base="prognum.class">
          <xs:attribute ref="class" default="- topic/prognum "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="prognum.class" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="words.cnt"/>
    </xs:choice>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

 
  <xs:element name="featnum">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>featnum</keyword>> element contains the feature
        number of a product in the document metadata.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
      <xs:complexContent>
        <xs:extension base="featnum.class">
          <xs:attribute ref="class" default="- topic/featnum "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="featnum.class" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="words.cnt"/>
    </xs:choice>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>


  <xs:element name="component">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>component</keyword>> element describes the component
        of the product that this topic is concerned with. For example, a product might
        be made up of many components, each of which is installable separately. Components
        might also be shared by several products so that the same component is available
        for installation with many products. This identification can be used to check
        cross-component dependencies when some components are installed, but not others.
        It could also be used to make sure that topics are hidden, removed, or flagged
        in some way when the component they describe isn't installed. Such process-control
        logic is not currently supported in DITA processing.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
      <xs:complexContent>
        <xs:extension base="component.class">
          <xs:attribute ref="class" default="- topic/component "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="component.class" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="words.cnt"/>
    </xs:choice>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

 
  <xs:element name="prodname">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>prodname</keyword>> metadata element contains
        the name of the product that is supported by the information in this topic.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
      <xs:complexContent>
        <xs:extension base="prodname.class">
          <xs:attribute ref="class" default="- topic/prodname "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="prodname.class" mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="words.cnt"/>
    </xs:choice>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  <xs:group name="prodinfo.cnt">
    <xs:choice>
      <xs:group ref="brand"/>
      <xs:group ref="series"/>
      <xs:group ref="platform"/>
      <xs:group ref="prognum"/>
      <xs:group ref="featnum"/>
      <xs:group ref="component"/>
    </xs:choice>
  </xs:group>

  
  <xs:element name="vrmlist">
    <xs:annotation>
      <xs:documentation>The &lt;<keyword>vrmlist</keyword>> element contains a set of &lt;<keyword>vrm</keyword>>
        elements for logging the version, release, and modification information for
        multiple products or versions of products to which the topic applies.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="vrmlist.class">
          <xs:attribute ref="class" default="- topic/vrmlist "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="vrmlist.class">
    <xs:choice maxOccurs="unbounded">
      <xs:group ref="vrm" />
    </xs:choice>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

 
  <xs:element name="vrm">
    <xs:annotation>
      <xs:documentation>The empty &lt;<keyword>vrm</keyword>>  element contains information about a single product's
        version, modification, and release, to which the current topic applies.
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="vrm.class">
          <xs:attribute ref="class" default="- topic/vrm "/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
  <xs:complexType name="vrm.class">
    <xs:attribute name="version" type="xs:string" use="required"/>
    <xs:attribute name="release" type="xs:string"/>
    <xs:attribute name="modification" type="xs:string"/>
    <xs:attributeGroup ref="univ-atts"/>
    <xs:attributeGroup ref="global-atts"/>
  </xs:complexType>

  <xs:simpleType name="audience-type-att.class">
    <xs:restriction base="xs:string">
      <xs:enumeration value="user"/>
      <xs:enumeration value="purchaser"/>
      <xs:enumeration value="administrator"/>
      <xs:enumeration value="programmer"/>
      <xs:enumeration value="executive"/>
      <xs:enumeration value="services"/>
      <xs:enumeration value="other"/>
      <xs:enumeration value="-dita-use-conref-target"/>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>
