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From "Adrian Geissel" <ageis...@zenark.com>
Subject Re: [C2.0rc1] SLIGHTLY OFF TOPIC: Has anyone used Xalan extensions in Cocoon?
Date Fri, 19 Oct 2001 09:04:59 GMT
Oops - it's just a little too early on a Friday morning!

I 've spotted the error - the XPath expression was technically correct, but
the test data was not correctly Generated - thus it did not exist for the
transformer.

However, I hope that this approach may thus be of benefit to someone else,
albeit Xalan specific.
Regards,
Adrian

----- Original Message -----
From: Adrian Geissel <ageissel@zenark.com>
To: <cocoon-users@xml.apache.org>
Sent: Friday, October 19, 2001 9:34 AM
Subject: [C2.0rc1] SLIGHTLY OFF TOPIC: Has anyone used Xalan extensions in
Cocoon?


> Hi,
>
> I appologise in advance for posting to this mailing list, but I also think
> that the answer maybe of interest to the Cocoon community.
>
> What I am trying to do is to build a generic form within C2 that is
defined
> in an XSP which is aggregated with another path that will contain the data
> which is to be plugged into the form, thereby allowing for improved form
> (UI) reuse across scenarios. In trying to do this, I need the ability to
> perform run-time XPath evaluation, rather than at programming time.
>
> I have found a Xalan extension function (luckily before I wanted to write
my
> own :) that appears to do the trick. Its called "xalan:evaluate()" and
takes
> an XPath expression as a parameter, which in turn contains an XPath
> expression, which is then evaluated and returned.
>
> I've read the docs, but can't get it to work. The docs say to use the
> namespace   xmlns:xalan="http://xml.apache.org/xalan". I'm calling the
> extension function in my xml2html transformation stylesheet as follows:
>
> <xsl:stylesheet version="1.0"
>   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>   xmlns:xalan="http://xml.apache.org/xalan"
>   xmlns:zdam="zenark.com/zdam"
>   exclude-result-prefixes="xalan"
> >
>
> <xsl:template ...>
>
> ...
>         <xsl:choose>
>           <xsl:when test="@bind-to">
>             <xsl:attribute name="value"><xsl:value-of
> select="xalan:evaluate(@bind-to)"/></xsl:attribute>
>             </xsl:when>
>           <xsl:otherwise><xsl:attribute name="value"><xsl:value-of
> select="normalize-space()"/></xsl:attribute></xsl:otherwise>
>         </xsl:choose>
> ...
>
> </xsl:template>
>
> </xsl:stylesheet>
>
> The problem is that evaluate() returns '', rather than the expected real
> value. The returned XPath expression (in @bind-to) is correct.
>
> Any thoughts or experiences?
> Thanks in advance,
> Adrian
>
>
>
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