[xml] 2.9.2: XInclude and ID already defined

[Michael Day <mikeday yeslogic com>]

Hi,

In libxml 2.9.2 there are now error message if IDs are repeated in 
separate XIncluded documents. eg.

<root xmlns:xi="http://www.w3.org/2001/XInclude";>
<xi:include href="inc1.xml"/>
<xi:include href="inc2.xml"/>
</root>

where inc1.xml and inc2.xml both look like this:

<root xml:id="foo"/>

xmllint will give this error message:

doc.xml:1: element root: validity error : ID foo already defined

This error was not present in previous versions of libxml2, and it seems 
to have incorrect details, eg. it does not really occur on line 1 of 
doc.xml.

Michael

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