xml-dev - XML-Data Samples

[Sung_Nguyen@datacard.com (Sung Nguyen)]

     Hello all:
     
     I am a newbie to XML - I used IBM Alpha XML Parser to
     work on these following samples (from XML-Data spec).
     
     I don't understand what is the context of "schema" in this
     sample.  
     
     Is the schema is a XML DTD or just XML file?
     How do I include it into my XML file?
     
     Please enlighten me - I greatly appreciate.
     
     SeanN 
     
     ---------------------------------------------------------------
     <?xml:namespace name="http://company.com/schemas/books/" as="bk"/>
     <?xml:namespace name="http://www.ecom.org/schemas/dc/" as="ecom" ?>
     
     <bk:booksAndAuthors>
         <Person>
             <name>Henry Ford</name>
             <birthday>1863</birthday>
         </Person>
     
         <Person>
             <name>Harvey S. Firestone</name>
         </Person>
     
         <Person>
             <name>Samuel Crowther</name>
         </Person>
     
         <Book>
             <author>Henry Ford</author>
             <author>Samuel Crowther</author>
             <title>My Life and Work</title>
         </Book>
     
         <Book>
             <author>Harvey S. Firestone</author>
             <author>Samuel Crowther</author>
             <title>Men and Rubber</title>
             <ecom:price>23.95</ecom:price>
         </Book>
     </bk:booksAndAuthors>
     
     --------------------------------------------------------------------
     The schema for http://company.com/schemas/books: 
     
     <?xml:namespace name="urn:uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882/" 
     as="s"/?>
     <?xml:namespace href="http://www.ecom.org/schemas/ecom/" as="ecom" ?>
     
     <s:schema>
     
         <elementType id="name">
             <string/>
         </elementType>
     
         <elementType id="birthday">
             <string/>
             <dataType dt="date.ISO8601"/>
         </elementType>
     
         <elementType id="Person">
             <element type="#name" id="p1"/>
             <element type="#birthday" occurs="OPTIONAL">
                 <min>1700-01-01</min><max>2100-01-01</max>
             </element>
             <key id="k1"><keyPart href="#p1" /></key>
         </elementType>
     
         <elementType id="author">
             <string/>
             <domain type="#Book"/>
             <foreignKey range="#Person" key="#k1"/>
         </elementType>
     
         <elementType id="writtenWork">
             <element type="#author" occurs="ONEORMORE"/>
         </elementType>
     
         <elementType id="Book" >
             <genus type="#writtenWork"/>
             <superType href=" 
     http://www.ecom.org/schemas/ecom/commercialItem"/>
             <superType href=" 
     http://www.ecom.org/schemas/ecom/inventoryItem"/>
             <group groupOrder="SEQ" occurs="OPTIONAL">
                 <element type="#preface"/>
                 <element type="#introduction"/>
             </group>
             <element href="http://www.ecom.org/schemas/ecom/price"/>
             <element href="ecom:quantityOnHand"/>
         </elementType>
     
         <elementTypeEquivalent id="livre" type="#Book"/>
         <elementTypeEquivalent id="auteur" type="#author"/>
     
     </s:schema>

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