RE: XQ.E13 - how to construct a node in a namespace with computed name?

Personal response:

You can do this with a computed element constructor (or attribute
constructor):

element {QName($namespace, $local)}{ "content" }

It was never intended that namespaces in a namespace declaration attribute
should be computable by including enclosed expressions: this wouldn't work,
because such declarations as well as causing namespaces to be added to the
constructed node at run-time, also cause namespaces to be added to the
static context, which means they must be statically known. This is why the
existing (pre-erratum) text in 3.7.1.2 says "The value of a namespace
declaration attribute must be a URILiteral; otherwise a static error is
raised [err:XQST0022].". The purpose of the erratum was to reconcile this
with the BNF productions, which indicate that doubled curly-braces and
quotation marks are recognized. 

Michael Kay
Saxonica


> -----Original Message-----
> From: public-qt-comments-request@w3.org 
> [mailto:public-qt-comments-request@w3.org] On Behalf Of 
> Krzysztof Maczynski
> Sent: 02 June 2009 13:01
> To: public-qt-comments@w3.org
> Subject: XQ.E13 - how to construct a node in a namespace with 
> computed name?
> 
> Dear WG,
> 
> I know I'm writing a bit past the PER review period, but for 
> the last few days I've been deprived of Internet access - 
> hope your internal process still allows doing something 
> meaningful with my input. Having read the erratum XQ.E13 for 
> XQuery 1.0 I'm wondering how I should proceed in order to 
> construct an element or attribute in a namespace whose name 
> is to result from an expression instead of being given 
> literally as a URI. Is this being made intentionally 
> impossible? If so, why? If not, what's the workaround and why 
> should we be forced to use it?
>