Re: [xsl] treating variables like nodes - testing for existence

[Esha Datta <edatta@xxxxxxxx>]

Thanks Dimitre, that worked. I had spent time researching on RTFs 
though, just couldn't figure this out.

Esha
At 11:10 PM 5/1/2006, you wrote:


> Date: Mon, 1 May 2006 15:48:05 -0700
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> From: "Dimitre Novatchev" <dnovatchev@xxxxxxxxx>
> Subject: Re: [xsl] treating variables like nodes - testing for existence
> Message-ID: <1563432b0605011548s456e8ee3gf62e2e454bfcf19b@xxxxxxxxxxxxxx>
>
> Result Tree Fragment is a fundamental concept in XSLT 1.0. Do
> read/search on this subject.
>
> As the time does not permit, below is a quick fix to your problem:
>
> Instead of:
>
>     >                 <xsl:with-param name=3D"test" select=3D"$test"/>
>
> use:
>                        <xsl:with-param name=3D"test" select=3D"string($test=
> )"/>
>
> --
> Cheers,
> Dimitre Novatchev
> ---------------------------------------
> Truly great madness cannot be achieved without significant intelligence.
>
> On 5/1/06, Esha Datta <edatta@xxxxxxxx> wrote:
> >
> > >hi all,
> > >
> > >I am trying to write code that will treat a variable as a node.  If
> > >a variable is empty, I want the stylesheet to think it's
> > >non-existent rather than existing, but empty. For example, I am
> > >trying to parse out a string from element, foo. If the value exists,
> > >I want it to print <test>value of foo</test>.  If it doesn't exist,
> > >I don't want it to print out anything. Right now, it still prints
> > >out the tags because the variable exists but is empty at this point.
> > >Is there any way to check for variable existence like one can with
> > >nodes?  So if the variable is empty after parsing out the element, I
> > >want the stylesheet to think that there is no variable. The larger
> > >issue is that we have templates that process nodes and print output
> > >if they exist or if the nodes exist, but there is no value.  There
> > >are some nodes to which we do some processing or parsing where we
> > >need variables(like with foo in the example below), when we pass
> > >these variables to templates, I want these templates to treat these
> > >variables like nodes.  Thanks for your help!
> > >
> > >
> > >stylesheet:
> > ><xsl:stylesheet version=3D"1.0"
> > >xmlns:xsl=3D"http://www.w3.org/1999/XSL/Transform";
> > >xmlns:fo=3D"http://www.w3.org/1999/XSL/Format";>
> > >
> > ><xsl:template match=3D"/">
> > ><xml>
> > ><xsl:for-each select=3D"//foo">
> > >         <xsl:variable name=3D"test">
> > >                 <xsl:if test=3D"contains(.,'em')">
> > >                 <xsl:value-of select=3D"substring-after(.,'em: ')"/></x=
> sl:if>
> > >         </xsl:variable>
> > >         <xsl:call-template name=3D"runTest">
> > >                 <xsl:with-param name=3D"test" select=3D"$test"/>
> > >         </xsl:call-template>
> > ></xsl:for-each>
> > ></xml>
> > ></xsl:template>
> > >
> > ><xsl:template name=3D"runTest">
> > >         <xsl:param name=3D"test"/>
> > >
> > >         <xsl:if test=3D"$test">
> > >             <test>
> > >                 <xsl:value-of select=3D"$test"/>
> > >           </test>
> > >         </xsl:if>
> > ></xsl:template>
> > ></xsl:stylesheet>
> > >
> > >xml file:
> > ><xml>
> > ><foo>bar1</foo>
> > ><foo>bar;em: bar2</foo>
> > ></xml>
> > >
> > >This is the result I get:
> > ><xml xmlns:fo=3D"http://www.w3.org/1999/XSL/Format";>
> > >         <test />
> > >         <test>bar2</test>
> > ></xml>
> > >
> > >
> > >
> > >Esha Datta
> >
> >
> >
> > >Los Alamos National Laboratory Research Library