[xsl] XSLT, XML and Identity transform

["Michael PG" <xrow@xxxxxxx>]

Hello,

I am trying to solve following problem:

Today I use identity transform. to filter elements from my original XML file 
and create XML output file.
I have created two XSLTs (base.xslt and filter.xslt), where base.xslt does 
the identity transformation and filter.xslt defines filtering rules and 
templates.

What I basically want is to filter elements of type "sub" and sort them 
under one parent node and make selections of type "main" and sort them under 
another parent node. One parent node for each category. (see in Filtered XML 
how output shoul look like).

My input XML looks like:

[Original XML]

<Documents>
   <Document chapter="1" title="title 1" href="file1.xml">
         <Article title="1.1" info="sub"/>
         <Article title="1.2" info="main"/>
    </Document>
   <Document chapter="2" title="title 2" href="file2.xml">
         <Article title="2.1" info="sub"/>
         <Article title="2.2" info="main"/>
    </Document>
</Documents>


[Filtered XML SHOULD LOOK LIKE]

<Documents>
   <Document name="main">
         <Article title="1.2" info="main"/>
         <Article title="2.2" info="main"/>
    </Document>
   <Document name="sub">
         <Article title="1.1" info="sub"/>
         <Article title="2.1" info="sub"/>
    </Document>
</Documents>


[base.xslt]

<?xml version="1.0" encoding="UTF-8"?>

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>

    <!-- Import filter rules -->
       <xsl:include href="filter.xslt"/>

    <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
    <xsl:template match="node() | @*">
         <xsl:copy>
              <xsl:apply-templates select="node() | @*"/>
         </xsl:copy>
    </xsl:template>
</xsl:stylesheet>


[filter.xslt]

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
    <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
         <xsl:template match="Doc[not(@info='main')][not(@info='sub')]"/>
</xsl:stylesheet>


I would like to generate parent nodes groups automatically based on the 
filtered elements.
e.g. if elements containing info="main" are filtered, then they should be 
grouped under it's own parent node group called "main" (like in the output 
example), same with the other filtered element "sub" should have it's own 
group.

So, the pseudo should look something like this:

1. filter all elements where attribute info="main"
2. create parent node called "main" for elements where info="main"
3. place elements (Article) of attribute info="main" under parent node 
"main"

and so on iterate, untill original, input XML is filtered completely of the 
keywords located in filter.xslt

   <Document title="main">
         <Article title="1.2" info="main"/>
         <Article title="2.2" info="main"/>
    </Document>



Thank you in advance!


-xrow

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