[xml] Strange xpointer issue

[Michael Day <mikeday yeslogic com>]

Hi,

I'm experiencing a strange XPointer issue with the following XInclude:

    <xi:include href="foo.html" xpointer="xpointer(//p)"/>

Normally this works perfectly. However, if I configure libxml2 and 
specify --without-docbook, the XPointer no longer works:

    XInclude error : XPointer evaluation failed: #xpointer(//p)
    XInclude error : could not load foo.html, and no fallback was found

These are the configure options I am using:

If the --without-docbook option is removed, then the XPointer works. I'm 
baffled as to why DocBook support would have any effect on XPointer 
support, unless there is some underlying pointer bug or something that 
is only being revealed when particular modules are not linked in.

There are some checks for DocBook support in xpath.c and xpointer.c, but 
they only add the DocBook document node type to switch statements, so 
they seem fairly safe.

Any suggestions would be greatly appreciated!

Best regards,

Michael

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