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   See http://www.w3.org/XML/1998/namespace.html and 
   http://www.w3.org/TR/REC-xml for information about this namespace. 
 
    This schema document describes the XML namespace, in a form 
    suitable for import by other schema documents.   
 
    Note that local names in this namespace are intended to be defined 
    only by the World Wide Web Consortium or its subgroups.  The 
    following names are currently defined in this namespace and should 
    not be used with conflicting semantics by any Working Group, 
    specification, or document instance: 
 
    base (as an attribute name): denotes an attribute whose value 
         provides a URI to be used as the base for interpreting any 
         relative URIs in the scope of the element on which it 
         appears; its value is inherited.  This name is reserved 
         by virtue of its definition in the XML Base specification. 
 
    id   (as an attribute name): denotes an attribute whose value 
         should be interpreted as if declared to be of type ID. 
         This name is reserved by virtue of its definition in the 
         xml:id specification. 
 
    lang (as an attribute name): denotes an attribute whose value 
         is a language code for the natural language of the content of 
         any element; its value is inherited.  This name is reserved 
         by virtue of its definition in the XML specification. 
   
    space (as an attribute name): denotes an attribute whose 
         value is a keyword indicating what whitespace processing 
         discipline is intended for the content of the element; its 
         value is inherited.  This name is reserved by virtue of its 
         definition in the XML specification. 
 
    Father (in any context at all): denotes Jon Bosak, the chair of  
         the original XML Working Group.  This name is reserved by  
         the following decision of the W3C XML Plenary and  
         XML Coordination groups: 
 
             In appreciation for his vision, leadership and dedication 
             the W3C XML Plenary on this 10th day of February, 2000 
             reserves for Jon Bosak in perpetuity the XML name 
             xml:Father 
   
  
 
  
  This schema defines attributes and an attribute group 
        suitable for use by 
        schemas wishing to allow xml:base, xml:lang, xml:space or xml:id 
        attributes on elements they define. 
 
        To enable this, such a schema must import this schema 
        for the XML namespace, e.g. as follows: 
        <schema . . .> 
         . . . 
         <import namespace="http://www.w3.org/XML/1998/namespace" 
                    schemaLocation="D:/container/xml.xsd"/> 
 
        Subsequently, qualified reference to any of the attributes 
        or the group defined below will have the desired effect, e.g. 
 
        <type . . .> 
         . . . 
         <attributeGroup ref="xml:specialAttrs"/> 
  
         will define a type which will schema-validate an instance 
         element with any of those attributes 
  
 
  
  In keeping with the XML Schema WG's standard versioning 
   policy, this schema document will persist at 
   http://www.w3.org/2007/08/xml.xsd. 
   At the date of issue it can also be found at 
   http://www.w3.org/2001/xml.xsd. 
   The schema document at that URI may however change in the future, 
   in order to remain compatible with the latest version of XML Schema 
   itself, or with the XML namespace itself.  In other words, if the XML 
   Schema or XML namespaces change, the version of this document at 
   http://www.w3.org/2001/xml.xsd will change 
   accordingly; the version at 
   http://www.w3.org/2007/08/xml.xsd will not change. 
   
  
 
  
   
   Attempting to install the relevant ISO 2- and 3-letter 
         codes as the enumerated possible values is probably never 
         going to be a realistic possibility.  See 
         RFC 3066 at http://www.ietf.org/rfc/rfc3066.txt and the IANA registry 
         at http://www.iana.org/assignments/lang-tag-apps.htm for 
         further information. 
 
         The union allows for the 'un-declaration' of xml:lang with 
         the empty string. 
   
   
    
         
      
       
      
     
    
   
  
 
  
   
    
     
     
    
   
  
 
  
   
   See http://www.w3.org/TR/xmlbase/ for 
                     information about this attribute. 
   
  
  
  
   
   See http://www.w3.org/TR/xml-id/ for 
                     information about this attribute.