Edit D:\app\Administrator\product\11.2.0\dbhome_1\RDBMS\xml\schema\xmlcsx.xsd.11.0

<?xml version="1.0"?>
<xs:schema targetNamespace="http://www.w3.org/XML/1998/namespace" 
           xmlns:xs="http://www.w3.org/2001/XMLSchema" xml:lang="en">
   <xs:annotation>
      <xs:documentation>
          See http://www.w3.org/XML/1998/namespace.html and
          http://www.w3.org/TR/REC-xml for information about this namespace.
      </xs:documentation>
   </xs:annotation>

<xs:annotation>
      <xs:documentation>
          This schema defines attributes and an attribute group
          suitable for use by schemas wishing to allow xml:base, 
          xml:lang or xml:space attributes on elements they define.
          To enable this, such a schema must import this schema
          for the XML namespace.
          import namespace="http://www.w3.org/XML/1998/namespace"
                 schemaLocation="http://www.w3.org/2001/xml.xsd"
          Subsequently, qualified reference to any of the attributes
          or the group defined below will have the desired effect.
      </xs:documentation>
   </xs:annotation>

<xs:attribute name="lang" type="xs:language">
       <xs:annotation>
           <xs:documentation>
               In due course, we should install the relevant ISO 
               2- and 3-letter codes as the enumerated possible values...
           </xs:documentation>
       </xs:annotation>
    </xs:attribute>
        
    <xs:attribute name="space" default="preserve">
       <xs:simpleType>
          <xs:restriction base="xs:NCName"> 
             <xs:enumeration value="default"/>
             <xs:enumeration value="preserve"/>
          </xs:restriction>
        </xs:simpleType>
    </xs:attribute>
        
    <xs:attribute name="base" type="xs:anyURI">
       <xs:annotation>
          <xs:documentation>
            See http://www.w3.org/TR/xmlbase/ for information about this attribute.
          </xs:documentation>
       </xs:annotation>
    </xs:attribute>
        
    <xs:attributeGroup name="specialAttrs">
        <xs:attribute ref="xml:base"/>
        <xs:attribute ref="xml:lang"/>
        <xs:attribute ref="xml:space"/>
    </xs:attributeGroup>
</xs:schema>

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