<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:er="urn:oasis:names:tc:entity:xmlns:xml:catalog"
           targetNamespace="urn:oasis:names:tc:entity:xmlns:xml:catalog"
           elementFormDefault="qualified">

  <!-- $Id: catalog.xsd,v 1.15 2005/10/07 13:27:08 ndw Exp $ -->

  <xs:import namespace="http://www.w3.org/XML/1998/namespace"/>

  <xs:simpleType name="pubIdChars">
    <!-- A string of the characters defined as pubIdChar in production 13
         of the Second Edition of the XML 1.0 Recommendation. Does not include
         the whitespace characters because they're normalized by XML parsing. -->
    <xs:restriction base="xs:string">
      <xs:pattern value="[a-zA-Z0-9\-'\(\)+,./:=?;!*#@$_%]*"/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="publicIdentifier">
    <xs:restriction base="er:pubIdChars"/>
  </xs:simpleType>

  <xs:simpleType name="partialPublicIdentifier">
    <xs:restriction base="er:pubIdChars"/>
  </xs:simpleType>

  <xs:simpleType name="systemOrPublic">
    <xs:restriction base="xs:string">
      <xs:enumeration value="system"/>
      <xs:enumeration value="public"/>
    </xs:restriction>
  </xs:simpleType>

  <!-- The global attribute xml:base is not explicitly declared; -->
  <!-- it is allowed by the anyAttribute declarations. -->

  <xs:complexType name="catalog">
    <xs:choice minOccurs="1" maxOccurs="unbounded">
      <xs:element ref="er:public"/>
      <xs:element ref="er:system"/>
      <xs:element ref="er:uri"/>
      <xs:element ref="er:rewriteSystem"/>
      <xs:element ref="er:rewriteURI"/>
      <xs:element ref="er:uriSuffix"/>
      <xs:element ref="er:systemSuffix"/>
      <xs:element ref="er:delegatePublic"/>
      <xs:element ref="er:delegateSystem"/>
      <xs:element ref="er:delegateURI"/>
      <xs:element ref="er:nextCatalog"/>
      <xs:element ref="er:group"/>
      <xs:any namespace="##other" processContents="skip"/>
    </xs:choice>
    <xs:attribute name="id" type="xs:ID"/>
    <xs:attribute name="prefer" type="er:systemOrPublic"/>
    <xs:anyAttribute namespace="##other" processContents="lax"/>
  </xs:complexType>

  <xs:complexType name="public">
    <xs:complexContent>
      <xs:restriction base="xs:anyType">
        <xs:attribute name="publicId" type="er:publicIdentifier"
                       use="required"/>
        <xs:attribute name="uri" type="xs:anyURI" use="required"/>
        <xs:attribute name="id" type="xs:ID"/>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name="system">
    <xs:complexContent>
      <xs:restriction base="xs:anyType">
        <xs:attribute name="systemId" type="xs:string"
                       use="required"/>
        <xs:attribute name="uri" type="xs:anyURI" use="required"/>
        <xs:attribute name="id" type="xs:ID"/>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name="uri">
    <xs:complexContent>
      <xs:restriction base="xs:anyType">
        <xs:attribute name="name" type="xs:anyURI"
                       use="required"/>
        <xs:attribute name="uri" type="xs:anyURI" use="required"/>
        <xs:attribute name="id" type="xs:ID"/>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name="rewriteSystem">
    <xs:complexContent>
      <xs:restriction base="xs:anyType">
        <xs:attribute name="systemIdStartString"
                       type="xs:string"
                       use="required"/>
        <xs:attribute name="rewritePrefix" type="xs:string" use="required"/>
        <xs:attribute name="id" type="xs:ID"/>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name="rewriteURI">
    <xs:complexContent>
      <xs:restriction base="xs:anyType">
        <xs:attribute name="uriStartString"
                       type="xs:string"
                       use="required"/>
        <xs:attribute name="rewritePrefix" type="xs:string" use="required"/>
        <xs:attribute name="id" type="xs:ID"/>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name="systemSuffix">
    <xs:complexContent>
      <xs:restriction base="xs:anyType">
        <xs:attribute name="systemIdSuffix"
                       type="xs:string"
                       use="required"/>
        <xs:attribute name="uri" type="xs:anyURI" use="required"/>
        <xs:attribute name="id" type="xs:ID"/>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name="uriSuffix">
    <xs:complexContent>
      <xs:restriction base="xs:anyType">
        <xs:attribute name="uriSuffix"
                       type="xs:string"
                       use="required"/>
        <xs:attribute name="uri" type="xs:anyURI" use="required"/>
        <xs:attribute name="id" type="xs:ID"/>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name="delegatePublic">
    <xs:complexContent>
      <xs:restriction base="xs:anyType">
        <xs:attribute name="publicIdStartString"
                       type="er:partialPublicIdentifier"
                       use="required"/>
        <xs:attribute name="catalog" type="xs:anyURI" use="required"/>
        <xs:attribute name="id" type="xs:ID"/>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name="delegateSystem">
    <xs:complexContent>
      <xs:restriction base="xs:anyType">
        <xs:attribute name="systemIdStartString"
                       type="xs:string"
                       use="required"/>
        <xs:attribute name="catalog" type="xs:anyURI" use="required"/>
        <xs:attribute name="id" type="xs:ID"/>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name="delegateURI">
    <xs:complexContent>
      <xs:restriction base="xs:anyType">
        <xs:attribute name="uriStartString"
                       type="xs:string"
                       use="required"/>
        <xs:attribute name="catalog" type="xs:anyURI" use="required"/>
        <xs:attribute name="id" type="xs:ID"/>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name="nextCatalog">
    <xs:complexContent>
      <xs:restriction base="xs:anyType">
        <xs:attribute name="catalog" type="xs:anyURI" use="required"/>
        <xs:attribute name="id" type="xs:ID"/>
        <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name="group">
    <xs:choice minOccurs="1" maxOccurs="unbounded">
      <xs:element ref="er:public"/>
      <xs:element ref="er:system"/>
      <xs:element ref="er:uri"/>
      <xs:element ref="er:rewriteSystem"/>
      <xs:element ref="er:rewriteURI"/>
      <xs:element ref="er:uriSuffix"/>
      <xs:element ref="er:systemSuffix"/>
      <xs:element ref="er:delegatePublic"/>
      <xs:element ref="er:delegateSystem"/>
      <xs:element ref="er:delegateURI"/>
      <xs:element ref="er:nextCatalog"/>
      <xs:any namespace="##other" processContents="skip"/>
    </xs:choice>
    <xs:attribute name="prefer" type="er:systemOrPublic"/>
    <xs:attribute name="id" type="xs:ID"/>
    <xs:anyAttribute namespace="##other" processContents="lax"/>
  </xs:complexType>

  <xs:element name="catalog" type="er:catalog"/>
  <xs:element name="public" type="er:public"/>
  <xs:element name="system" type="er:system"/>
  <xs:element name="uri" type="er:uri"/>
  <xs:element name="rewriteSystem" type="er:rewriteSystem"/>
  <xs:element name="rewriteURI" type="er:rewriteURI"/>
  <xs:element name="systemSuffix" type="er:systemSuffix"/>
  <xs:element name="uriSuffix" type="er:uriSuffix"/>
  <xs:element name="delegatePublic" type="er:delegatePublic"/>
  <xs:element name="delegateSystem" type="er:delegateSystem"/>
  <xs:element name="delegateURI" type="er:delegateURI"/>
  <xs:element name="nextCatalog" type="er:nextCatalog"/>
  <xs:element name="group" type="er:group"/>

</xs:schema>

