Re: [xsl] Lookup tables

["Joe Fawcett" <joefawcett@xxxxxxxxxxx>]

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
   version="1.0">
   <xsl:key name="getKeyByName" match="Keys/Key" use="@name" />

   <xsl:template match="/">
     <example>
       <xsl:copy-of select="key('getKeyByName', A/B/C/Referrer/@ref)" />
     </example>
   </xsl:template>

</xsl:stylesheet>

Joe Fawcett
http://joe.fawcett.name


----- Original Message ----- 
From: "Kamal Bhatt" <kbhatt@xxxxxxxxx>
To: <xsl-list@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Friday, March 16, 2007 1:40 AM
Subject: Re: [xsl] Lookup tables


> Joe Fawcett wrote:
> > Kamal Bhatt
> >
> > I would have thought that you could use data embedded in the XML, but 
> > access via a key. This is declared using xsl:key in the XSLT and 
> > retrieved using the key function, see 
> > http://www.w3schools.com/xsl/func_key.asp.
> I tried to use a key, but couldn't get it to "go backwards". Maybe I am 
> using it incorrectly
> > Another possibility is to embed the data in the XSLT, via an include 
> > maybe, and access via document(''). The disadvantage of this is that 
> > document(''), which points to the stylesheet itself, does not always work 
> > "out of the box", for example if the XSLT has been fetched from a 
> > database table. In that case they are things you can do to make it work, 
> > a custom XmlResolver in .NET and the same, I think, in Java.
> The lookup table is part of the XML, with the key embedded in a child eg:
>
> <A>
>  <Keys>
>     <Key value="abc123" name="key1"/>
>     <Key value="abc432" name="key2"/>
>  </Keys>
>  <B>
>     <C>
>      <Referrer ref="key1"/>
>    </C>
>   </B
> </A>
>
> If someone can give me an example where you match Referrer and get the 
> value from Key (without using ancestor or '..' syntax), that would be 
> great.
> > Joe Fawcett (MVP - XML)
> > http://joe.fawcett.name
> >
> > ----- Original Message ----- From: "Kamal Bhatt" <kbhatt@xxxxxxxxx>
> > To: <xsl-list@xxxxxxxxxxxxxxxxxxxxxx>
> > Sent: Friday, March 16, 2007 1:09 AM
> > Subject: [xsl] Lookup tables
> >
> >
> > > Hi
> > > My company is designing XML specifically for XSLT processing. A question 
> > > that has come up is the use of lookup tables. We have a lot of repeated 
> > > data, and our system  architect would like that data put in a "lookup 
> > > table" at the top of the XML. By lookup table I mean XML with some key 
> > > that can be identified. The only way I can think of processing this XML 
> > > in XSLT 1.0 (without a lot of '..') is to use something like
> > >
> > > ancestor::node()//LookUp/Parameter[@key = 'key_to_lookup'].
> > >
> > > First question, is there another way of doing this, secondly, in XSLT 
> > > parsers, particular those that use SAX, is there a major performance hit 
> > > in using this method over having the data repeated.
> > >
> > > Personally, I would prefer avoiding ancestor::node() and I would 
> > > definitely like to avoid //.
> > >
> > > Cheers.
> > >
> > > --
> > > Kamal Bhatt
>
>
> --
> Kamal Bhatt