RE: [xsl] Keeping a map in my XSL

Subject: RE: [xsl] Keeping a map in my XSL
From: "Nathan Young \(natyoung\)" <natyoung@xxxxxxxxx>
Date: Tue, 13 Sep 2005 10:43:21 -0700

Kevin, I've done something like what you want to do using the document
function and xpaths.  I agree with Andrew's suggestion about not relying
on document order to associate key/value pairs, but we have values that
can contain elements so we use something more like:

   <key name="1">value of name 1</key>
   <key name="7">value of name 7</key>

That's in a separate file from the xsl (say map.xml).

Then in the xsl you can use:

<xsl:variable name="map" select="document('map.xml')"/>

To get then value for 1 you can use:

<xsl:value-of select="$map//key[@name='1']/>

Andrew would your xsl:key solution apply to this?  If so how?


> -----Original Message-----
> From: andrew welch [mailto:andrew.j.welch@xxxxxxxxx]
> Sent: Tuesday, September 13, 2005 9:02 AM
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [xsl] Keeping a map in my XSL
> On 9/13/05, Kevin L. Cobb <kevin.cobb@xxxxxxxxxxxx> wrote:
> > I want to be able to set a variable that is retreived from
> my XML I am
> > parsing to a mapped values. For example, lets say I have an
> XML map that
> > looks like this:
> >
> > <map>
> >         <key>12345</key><value>abcde</key>
> >         <key>78910</key><value>lmnop</value>
> > </map>
> >
> > My source XML has the value '12345' in a certain field. I
> retreive the
> > field as usual in XSL and then I want to get the mapped
> value of this
> > field. The map above is "included" in my XSL. Is there a
> best way to do
> > this in XSL?
> yes, first restructure your map as associating a key and value by
> position is a bad idea, much better to use attributes:
> <map>
>   <key name="12345" value="abcde"/>
>   <key name="78910" value="lmnop"/>
> </map>
> then define a key to return a value for a given name:
> <xsl:key name="mappings" match="key" use="@name"/>
> then in xslt 1.0 use:
> <xsl:variable name="lookup" select="the_name_you_want_lookup"/>
> <xsl:for-each select="$map">
>   <xsl:value-of select="key('mappings', $lookup)/@value"/>
> </xsl:for-each>
> in 2.0 you don't have the hassle of switching the context node because
> key() can take it as the third argument:
>   <xsl:value-of select="key('mappings', the_name_you_want_to_lookup,
> $mappings)/@value"/>
> cheers
> andrew

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