[xsl] Re: [saxon] Use of QName forcing declaration "Unused" namespaces

["Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

If the QNames are names of elements in the source document, then you shouldn't
be calling name() to get the lexical QName, and then calling xs:QName to turn
it back into an xs:QName value, because that loses information (specifically,
the namespace bindings that were in scope in the source document). Instead,
you should use the node-name() function to get the name as an xs:QName value
in the first place.

I may have misunderstood what's going on here, but I think this is the heart
of the issue: if you're going to manipulate QNames, then you need to get them
out of lexical format and into structured xs:QName format as early as
possible, while the original namespace bindings are still known.

Michael Kay
Saxonica

> On 21 Jul 2020, at 15:02, Ihe Onwuka <ihe.onwuka@xxxxxxxxx> wrote:
>
> Every element in my input doc is in one of  5 namespaces that I have
declared globally in the stylesheet. However the stylesheet as written never
explicitly references any of the 5 namespaces so  I would like to genericize
it by doing away with the namespace declarations.
>
> However if I remove any one of the namespaces I get this error.
>
> Error at char 79 in expression in xsl:sequence/@select on line 14 column 118
of ***.xsl:
>   FONS0004  Namespace prefix {jx} has not been declared
> at function local:localizedName on line 12 of ***.xsl:
>
> Here is the function local:localizedName which is designed to return  a
local name from a QName or a string.
>
> <xsl:function name="local:localizedName" as="xs:string?">
>       <xsl:param name="name"/>
>       <xsl:sequence select="local-name-from-QName(if ($name instance of
xs:QName) then $name else xs:QName($name))"/>
>    </xsl:function>
>
> It seems that casting anything as QName mandates that the namespace prefix
in whatever is being cast must be declared , even if it's not explicitly
referenced.
>
> e.g xs:string(xs:QName($someName)) will fail if $someName contains 'ab:cde'
and you haven't declared the ab prefix anywhere (even if you don't otherwise
use it).
>
> In which case my goal is better achieved by eradicating the QNames and
resorting to string manipulation to extract the local part of the name.
>
> Comments, observations, corrections please.
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