XHTML with embedded XQuery: how to deal with the DOCTYPE declaration? How to deal with the default XHTML namespaces?

Michael Kay mike at saxonica.com
Sat Mar 27 16:51:19 PST 2010

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XHTML with embedded XQuery: how to deal with the
DOCTYPE declaration? How to deal with the default XHTML namespaces?

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> 
> I am creating an XHTML document and embedding XQuery in it:
> 
> QUESTION #1
> 
> When I execute the XHTML document (containing XQuery) I get 
> an error message regarding the DOCTYPE declaration:

XQuery syntax is a bit like XML, but it isn't real XML, don't imagine that
anything that's OK in XML is OK in XQuery.

> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

Yes, an unfortunate bit of design. Because so many people hit problems with
the XPath 1.0 rule that "no prefix means no namespace", XQuery designers
thought it would be better to have the rule "no prefix means the default
namespace". Unfortunately this causes problems if the default namespace for
the output document is different from the default namespace for the input
document. XSLT 2.0 solves this by allowing different defaults for the input
and the output (the xpath-default-namespace attribute), but the XQuery
designers thought this was too much complexity.
> 
> Neither approach is very attractive. Is there a better approach?

No. XQuery 1.1 will allow you to use URIs wherever you can use prefixes, so
you can write //"":planet. (This hasn't yet made it into the published
working draft.)

Regards,

Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay

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