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Re: RE: Returning A Tree
- To: "'xsl-list at lists dot mulberrytech dot com'" <xsl-list at lists dot mulberrytech dot com>
- Subject: Re: [xsl] RE: Returning A Tree
- From: "Swen Thuemmler" <Swen dot Thuemmler at paderlinx dot de>
- Date: Thu, 6 Sep 2001 10:51:26 +0200 (CEST)
- Reply-To: xsl-list at lists dot mulberrytech dot com
On Wed, 5 Sep 2001, Darren Hayduk wrote:
> OK, here is an example.
[...]
> <xsl:template name="selectNodes">
> <xsl:param name="doWhat"/>
> <xsl:choose>
> <xsl:when test="$doWhat='GiveMeA'">
> <xsl:for-each select="//A">
> <xsl:value-of select="."/>
This only gives you a text node with the string value of A.
> </xsl:for-each>
> </xsl:when>
> <xsl:when test="$doWhat='GiveMeB'">
> <xsl:copy-of select="//B"/>
Ok, here you have a node-set.
> </xsl:when>
> </xsl:choose>
> </xsl:template>
Now, you can't return a node-set with call-template, so your variable now contains
a result tree fragment (when you use xsl:copy-of select="$B", you get:
<B>B1</B>
<B>B2</B>
<B>B3</B>
<B>B4</B>
Now in XSL1.0, the only thing you can do with a node set is converting it to a
string or copy it to the current output destination. But some processors have
an extension function, which allows you to convert this to a node-set (containing
a single synthetic root node which has in your case the B nodes as children)
[Note: this is just my understanding, I might be wrong here].
You could then do something like (I think):
<xsl:for-each select="saxon:node-set($B)/B">
<xsl:value-of select="."/>
<xsl:if test="not(position()=last())">
<xsl:text>,</xsl:text>
</xsl:if>
</xsl:for-each>
But newer processors seemt to do the conversion themselves (in anticipation of
the changes in XSL-1.1 (or 2.0), so with Saxon 6.4 I can also say:
<xsl:for-each select="$B/B">
<xsl:value-of select="."/>
<xsl:if test="not(position()=last())">
<xsl:text>,</xsl:text>
</xsl:if>
</xsl:for-each>
Hope this helps
--Swen
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