<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>
 <xsl:param name="pPref" select="'ex'"/>

 <xsl:template match="/*">
  <xsl:value-of select="namespace::*[name()=$pPref]"/>
 </xsl:template>
</xsl:stylesheet>

produces:

http://example.com/ns/ex#

Cheers,

Dimitre

On Fri, Dec 14, 2012 at 7:14 AM, Tim rdf <timrdf@xxxxxxxxx> wrote:
> <prov:document
>     xmlns:prov="http://www.w3.org/ns/prov#"
>     xmlns:ex="http://example.com/ns/ex#">
>
>   <prov:wasInvalidatedBy>
>     <prov:entity prov:ref="ex:The-Painter"/>
>     <prov:activity prov:ref="ex:crash"/>
>     <prov:time>1998-09-03T01:31:00</prov:time>
>     <ex:circumstances>plane accident</ex:circumstances>
>   </prov:wasInvalidatedBy>
>
> </prov:document>



-- 
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
To avoid situations in which you might make mistakes may be the
biggest mistake of all
------------------------------------
Quality means doing it right when no one is looking.
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
-------------------------------------
Facts do not cease to exist because they are ignored.
-------------------------------------
Typing monkeys will write all Shakespeare's works in 200yrs.Will they
write all patents, too? :)
-------------------------------------
I finally figured out the only reason to be alive is to enjoy it.