Unable to get XInclude to work on any examples

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>
>Hi,
>
> 
>
>I have been trying to get XInclude to work on several examples, including the
>C.1 Basic Inclusion Example (see below or click here to see the web example
><http://www.w3.org/TR/xinclude> .)  On all examples tested, the Validator for
>XML Schema REC (20010502) version reports:
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> 
>
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>Low-level XML well-formedness and/or validity processing output
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>Error: Expected whitespace after public id
> in unnamed entity at line 1 char 62 of http://www.w3.org/2001/XInclude
>http://www.w3.org/2001/XInclude has no elements???
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>Does anyone know the solution to this problem?
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>Thanks in advance,
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> 
>
>Ken
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>C.1 Basic Inclusion Example
>
>
>The following XML document contains an xi:include element which points to an
>external document. Assume the base URI of this document is
>http://www.example.org/document.xml.
>
><?xml version='1.0'?>
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><document xmlns:xi="http://www.w3.org/2001/XInclude">
>
>  <p>120 Mz is adequate for an average home user.</p>
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>  <xi:include href="disclaimer.xml"/>
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></document>
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>disclaimer.xml contains:
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><?xml version='1.0'?>
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><disclaimer>
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>  <p>The opinions represented herein represent those of the individual
>
>  and should not be interpreted as official policy endorsed by this
>
>  organization.</p>
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></disclaimer>
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> 
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>
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