Implementation of fn:id() function

Hello,

I've been trying to use the Xpath v2.0 function fn:id() but it doesn't run 
well.I don't know if I use it in a bad way or if the Xquery processors don't 
support it. I think there aren't any encoding problems and I also think I 
use this function in a good way.
I enclose the files that I use in my examples. The example is very stupid 
however it's very easy for testing the id() function. I have a xs:IDREFS 
attribute called "people" in the "departament" element and I want to 
retrieve their xs:ID that are in the element person. After that, I print 
whatever to check if I run well.
XML-Document


<?xml version="1.0" encoding="UTF-8"?>
<document xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:noNamespaceSchemaLocation="schema.xsd">
 <people>
   <person id="id1" name="John"/>
   <person id="id2" name="Peter"/>
   <person id="id3" name="Anne"/>
 </people>
 <departaments>
   <departament nam="Computer" people="id1 id2"/>
   <departament nam="Business" people="id2 id3"/>
 </departaments>
</document>

XQuery Document

xquery version "1.0";

  <data>{
   for $s in doc("example.xml")/document/departaments/departament
           let $b2:=id($s/@people)/@name
           return <depart>{
           if ($b2='John') then $s/@nam
           else ()
           }</depart>
  }</data>

XML_Schema

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"; 
elementFormDefault="qualified">
 <xs:element name="departament">
   <xs:complexType>
         <xs:attribute name="nam" type="xs:string" use="required"/>
         <xs:attribute name="people" type="xs:string" use="required"/>
   </xs:complexType>
 </xs:element>
 <xs:element name="departaments">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="departament" maxOccurs="unbounded"/>
     </xs:sequence>
   </xs:complexType>
 </xs:element>
 <xs:element name="document">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="people"/>
       <xs:element ref="departaments"/>
     </xs:sequence>
   </xs:complexType>
 </xs:element>
 <xs:element name="people">
   <xs:complexType>
     <xs:sequence>
       <xs:element ref="person" maxOccurs="unbounded"/>
     </xs:sequence>
   </xs:complexType>
 </xs:element>
 <xs:element name="person">
   <xs:complexType>
      <xs:attribute name="id" type="xs:ID" use="required"/>
     <xs:attribute name="name" type="xs:string" use="required"/>
   </xs:complexType>
 </xs:element>
</xs:schema>

Thanks for all,

Luis




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