RE: [xsl] re: generation of qnames/prefixes in content and value [was xbind:module....]

["Michael Kay" <mhkay@xxxxxxxxxxxx>]

> Actually, as far I can tell, it would also prevent the
> generation of any XML
> application that used qualified names in contexts other than tag or
> attribute names.
>

Actually it *is* possible to safely output a QName as an attribute value,
given the statements in the XSLT 1.0 errata about the effect of copying a
namespace node. It's pretty obscure territory though, and you may find that
not all processors get it right.

You can produce a namespace node in the result tree by copying a namespace
node either from a source document or the stylesheet. Normally namespace
nodes are copied when a source element is copied using <xsl:copy> or when a
literal result element in the stylesheet is copied; however one of the
errata makes it clear that if there are no conflicts, you can also copy a
namespace node using <xsl:copy> or <xsl:copy-of>, which means you can inject
a new namespace node into the result by having a secondary source document

   <dummy xmlns:ppp="some.namespace.uri"/>

and doing <xsl:copy-of select="document('dummy.xml')/*/namespace::ppp"/>

When a namespace node is present on the result tree, the serializer must
output a namespace declaration for it, and it is not allowed to change
either the prefix or the URI.

This means you can safely use this prefix in the value of a generated
attribute.

Mike Kay


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