selector xpath descendant::* question

[Jose Luis Zabalza]

Hello everybody.

I am newbie so it is posible this will be a nosense question. Sorry.

I want to define a tree on XML file with references to his
nodes and xscheme validate. I am using SCMPrint xerces 2.7 C++ example to
*validate* xchema file and SAXPrint example to validate xml file.

This is the xml file example.

<!-- ============= nodes.xml ================ -->
<?xml version="1.0" encoding="iso-8859-1" ?>

<MAIN  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
      xsi:noNamespaceSchemaLocation='nodes.xsd'>

 <TREE>
   <NODE id="1">
     <NODE id="1_1">
       <NODE id="1_1_1"/>
        <NODE id="1_1_2"/>
     </NODE>

     <NODE id="1_2">
        <NODE id="1_2_1"/>
        <NODE id="1_2_2"/>
     </NODE>
   </NODE>
   <NODE id="2">
     <NODE id="2_1">
       <NODE id="2_1_1"/>
        <NODE id="2_1_2"/>
     </NODE>
     <NODE id="2_2">
        <NODE id="2_2_1"/>
        <NODE id="2_2_2"/>
     </NODE>
   </NODE>

<!-- This is a error example. Duplicate definition -->
   <NODE id="2_1_2"/>
 </TREE>

 <REFERENCES>
   <REFERENCE ref="1"/>
   <REFERENCE ref="1_1"/>
   <REFERENCE ref="1_2_1"/>

<!-- this is a error example. No defined reference. -->
   <REFERENCE ref="3"/>

 </REFERENCES>
</MAIN>
<!-- ============== EOF =================== -->



I think this the correct xscheme file.



<!-- ============= nodes.xsd ================ -->
<?xml version="1.0" encoding="ISO-8859-1" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";>


 <!-- =================================================== -->
 <xsd:complexType name="TypeNode">
   <xsd:sequence>
     <xsd:element name="NODE" type="TypeNode"
        minOccurs="0"
        maxOccurs='unbounded'/>

   </xsd:sequence>
   <xsd:attribute name="id" type="xsd:string" use="required"/>
 </xsd:complexType>

 <!-- =================================================== -->
 <xsd:complexType name="TypeRefNode">
   <xsd:attribute name="ref" type="xsd:string" use="required"/>
 </xsd:complexType>


 <!-- =================================================== -->
 <xsd:element name="MAIN">
   <xsd:complexType>
     <xsd:sequence>
        <xsd:element name="TREE">
          <xsd:complexType>
            <xsd:sequence>
              <xsd:element name="NODE"  type="TypeNode"
                minOccurs="0"
                maxOccurs='unbounded'/>
            </xsd:sequence>
          </xsd:complexType>
        </xsd:element>

        <xsd:element name="REFERENCES" >
          <xsd:complexType>
            <xsd:sequence>
              <xsd:element name="REFERENCE"  type="TypeRefNode"
                minOccurs="0"
                maxOccurs='unbounded'/>
            </xsd:sequence>
          </xsd:complexType>
        </xsd:element>
     </xsd:sequence>
   </xsd:complexType>


   <xsd:key name="IdNodes">
     <xsd:selector xpath="TREE/descendant::*"/>
     <xsd:field xpath="@id"/>
   </xsd:key>

   <xsd:keyref name="IdRefNodes" refer="IdNodes">
     <xsd:selector xpath="REFERENCES/REFERENCE"/>
     <xsd:field xpath="@ref"/>
   </xsd:keyref>


 </xsd:element>
</xsd:schema>
<!-- ============== EOF =================== -->


If I execute :

==================================================
[EMAIL PROTECTED]:~/pro$ SCMPrint  nodes.xsd

Error at file /home/jlz/pro/nodes.xsd, line 50, char 49
 Message: XPath token not supported

Error at file /home/jlz/pro/nodes.xsd, line 54, char 51
 Message: Key reference declaration 'IdRefNodes' refers to unknown
key with name 'IdNodes'.
Did not parse a schema document cleanly so not printing Schema for
Schema XSModel information

==================================================

Xerces don't understand "descendant::*" XPath token. Why?

Is it correct?? How I can do this in other manner???

If I change

   <xsd:key name="IdNodes">
     <xsd:selector xpath="TREE/descendant::*"/>
     <xsd:field xpath="@id"/>
   </xsd:key>

by

   <xsd:key name="IdNodes">
     <xsd:selector xpath="TREE/*"/>
     <xsd:field xpath="@id"/>
   </xsd:key>


only the first children are identified. It's correct but it's not the
target.


Thank you very munch in avance.


--
José Luis Zabalza
jlz.3008 at gmail.com
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