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Re: Subject: RE: XML fragment as a param ?

Subject: Re: Subject: RE: XML fragment as a param ?
From: "Nick Fitzsimons" <nick@xxxxxxxxxxxxxx>
Date: Tue, 15 Nov 2005 18:37:57 -0000 (GMT)
streamsource from string
> When I do this :-
> transformer.setParameter(param.name, param.value);
> where param.name and param.value are both Strings and contain -
> "inboundXML"
> and "<Numbers><Odds><One>1</One>... "
> and when the stylesheet looks like this :-
> ...
>   <xsl:param name="inboundXML" select="/"/>
>   <xsl:template match="/">
>     <rootContainer>
>         <xsl:copy-of select="$inboundXML"/>
>     </rootContainer>
>   </xsl:template>
> ...
> I get this (almost correct but no cigar :-) :-
> <rootContainer>
>         &lt;Numbers&gt;&lt:Odds&gt;&lt;One&gt;1.....
> </rootContainer>

That's because you passed in a string containing characters which have to
be escaped in XML ("<" and ">" for example), so they were escaped to
ensure that the output was well-formed. You could use
"disable-output-escaping" if passing in a string is the path you want to

> Previously Michael commented :-

> Michael> Most products will allow you to supply a DOM
> node (they
> Michael> may restrict which DOM implementations you are allowed to use).
> Saxon allows
> Michael> you to supply any JAXP Source object, so if you supply a
> StreamSource
> Michael> containing raw XML, the XML will be parsed and the stylesheet
> will
> see the
> Michael> resulting document node as the parameter value.
> That's interesting I thought so I tried doing this (admittedly I'm not
> using
> Saxon (sorry Michael) so no guarantees) :-
> transformer.setParameter(param.name, new StreamSource(new
> StringReader(param.value)));
> but unfortunately all that gave me was :-
> <rootContainer>javax.xml.transform.stream.StreamSource@4c6ca8b6</rootContainer>

Which is also correct (in your environment) as that is the string
representation of the StreamSource: clearly the processor you are using
doesn't support using a StreamSource as a parameter, and so took the
result of that object's toString() method.

Have you tried passing a DOM node, as Michael suggested before mentioning
the StreamSource? You could then use:

   <xsl:param name="inboundXML" select="/"/>
   <xsl:template match="/">
         <xsl:apply-templates select="$inboundXML"/>

   <xsl:template match="Numbers">
      <!-- at this point you have matched the Numbers element in
           your inboundXML DOM, so do whatever you planned with it

If the XML you want to pass in is already in DOM form, then just use
setParameter (the following is JavaScript/MSXML, but should give you the

var requiredNode =
xslProcessor.addParameter("inboundXML", requiredNode); // setParameter in
your case

If you have the XML as a string, you'll probably want to scroll back up
and look into the disable-output-escaping option, although this can have
undesired side effects: in the future, somebody could pass any string into
your code and make it produce ill-formed output (for example, passing in

> I have tried using the exslt:node-set function, but I'm not sure I got it
> correct.

The extension "node-set" function will convert a result tree fragment into
a node set, so isn't really relevant in this case - although I may be
wrong, as every time I mention result tree fragments I make some basic
mistake, which Michael kindly corrects :-)


Nick Fitzsimons

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