[xsl] Re: keys and data files

[Richard Emberson <emberson at contact dot com>]

Actually, being new to xslt it was discovering that one could change the current
node to some imported document that was what surprised me that it actually worked.
What I did was:

input file:
<?xml version="1.0" encoding="UTF-8"?>
<SomeTag>
    <SomeOtherTag id="33322"/>
    <SomeOtherTag id="23492342"/>
</SomeTag>

testdata.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<!-- file: testdata.xml -->
<people>
    <person id="33322">
        <name>
            <first>tom</first>
            <last>jones</last>
        </name>
        <email>tjones@yahoo.com</email>
    </person>
    <person id="23492342">
        <name>
            <first>john</first>
            <last>donne</last>
        </name>
        <email>jdonne@somemail.com</email>
    </person>
    <person id="323423">
        <name>
            <first>frank</first>
            <last>wright</last>
        </name>
        <email>fwright@betterbuildings.com</email>
    </person>
</people>

processing file:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet
        version="1.0"
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
        xmlns:xalan="http://xml.apache.org/xslt";
        >

<xsl:key name="nv" match="people/person" use="@id"/>

<xsl:template match="SomeTag">
    <xsl:for-each select="child::SomeOtherTag">
        <xsl:variable name="id" select="@id"/>
        <xsl:for-each select="document('testdata.xml')">
            <xsl:variable name="node" select="key('nv', $id)"/>
<OUT>
Hi <xsl:value-of select="$node/name/first"/>,
Is "<xsl:value-of select="$node/email"/>" your email?
</OUT>
        </xsl:for-each>
    </xsl:for-each>
</xsl:template>
</xsl:stylesheet>

I was interested in a datastructure lookup capability. I originally had all the
data in a template using choose/when's for each type of data (first name, last
name, etc.) and yesterday morning I decided that there had to be a better
(object-oriented, group all the data together) way of doing it. Thus I came up
with the data structure lookup. (Of course I was not looking up first names, etc, but
rather xmlschema base and derived type information required for processing
xmlschema file converting the types to java classes).

I am cross posting to the xsl mailing list so that others can see the generality of
the "lookup table" technique; it can be used to lookup any static data as well as
markup instructions.

Richard



Dimitre Novatchev wrote:

> Richard,
>
> > I just joined the mailing list this morning. What was the "lookup" stylesheet?
>
> See:
>
> http://sources.redhat.com/ml/xsl-list/2001-06/msg01004.html
>
> and
>
> http://sources.redhat.com/ml/xsl-list/2001-06/msg01063.html
>
> The latter has a decent explanation "why this code works".

..........................


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