Re: [xsl] function-available() test on stylesheet functions

[Abel Braaksma <abel.online@xxxxxxxxx>]

John McGowan wrote:
> When calling function-available() inside of a  use-when attribute it
> will never return true for a user defined function.  The specs pretty
> much say this exactly.

A new try, I had some coffee now ;)
I looked it up in my projects, because I remember I had a similar 
problem. Actually, we included some helper functions for diagnosis when 
in a debug environment. Instead of writing tedious xsl:if/when/otherwise 
constructs, we defined several system properties, mainly to determine 
the context (debug, analysis, test, production) the stylesheets were used.

Now we could write something like:

<xsl:value-of select="myfun:analyze-this(....)" 
use-when="system-property('context') = 'debug'" />

Or, if you fancy that (not to everyone's taste), add it to you doctype 
and do:

<xsl:value-of select="myfun:analyze-this(....)" use-when="&debug;" />


Not sure this (again) addresses your problem domain, but it could be 
used to bring a (group of) stylesheet functions into the use-when and 
can even be used on xsl:import etc.

Cheers,
-- Abel Braaksma