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Re: [xsl] recursive sorting by element name
Subject: Re: [xsl] recursive sorting by element name
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Wed, 28 Nov 2007 17:45:02 -0500
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Davis,
This problem is actually quite straightforward in XSLT, using an
application of the "identity stylesheet" pattern, which works by
traversing the document through the usual recursive descent and
copying the input to the result as it goes.
Your only difference is that you will sort your elements as you descend.
So here's an identity template, one or another variant of which is
common to this family of solutions:
<xsl:template match="*">
<!-- matches any element -->
<xsl:copy>
<!-- copies the element -->
<xsl:copy-of select="@*"/>
<!-- copies its attributes, if any -->
<xsl:apply-templates/>
<!-- apply templates to the children -->
</xsl:copy>
</xsl:template>
And here is a modification of it that does what you want:
<xsl:template match="*">
<xsl:copy>
<xsl:copy-of select="@*"/>
<xsl:apply-templates>
<!-- apply templates to the children, writing results in
order sorted by name and @typename of the input -->
<xsl:sort select="name()"/>
<xsl:sort select="@typename"/>
</xsl:apply-templates>
</xsl:copy>
</xsl:template>
Note: untested. But try that as the single template in your
stylesheet and see what happens.
Cheers,
Wendell
At 05:04 PM 11/28/2007, you wrote:
Hi, consider the following example:
<Collection>
<CollectionB>
<B2></B2>
<A2></A2>
<A1></A1>
<B1 typeName="2"></B1>
<B1 typeName="1"></B1>
</CollectionB>
<CollectionA>
<B2></B2>
<A2></A2>
<A1></A1>
<B1></B1>
</CollectionA>
</Collection>
I want to sort it as such
<Collection>
<CollectionA>
<A1></A1>
<A2></A2>
<B1></B1>
<B2></B2>
</CollectionA>
<CollectionB>
<A1></A1>
<A2></A2>
<B1 typeName="1"></B1>
<B1 typeName="2"></B1>
<B2></B2>
</CollectionB>
</Collection>
I am trying to come up with a generic XSLT solution that does not use
explicit element names, but only uses the sort select="name()", and it
should be recursive such that if say, element <A1> contained further
elements, then they would also be sorted by element name.
Finally, if the element names are the same, then it should sort them
by an attribute called "typeName".
Can anyone provide some help? Thank you in advance!
======================================================================
Wendell Piez mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc. http://www.mulberrytech.com
17 West Jefferson Street Direct Phone: 301/315-9635
Suite 207 Phone: 301/315-9631
Rockville, MD 20850 Fax: 301/315-8285
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Mulberry Technologies: A Consultancy Specializing in SGML and XML
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