Subject: Re: [xsl] Key/Use From: David Carlisle <davidc@xxxxxxxxx> Date: Wed, 5 Sep 2001 15:11:54 +0100 |
Excuse my ignorance but, why is this <xsl:key name="lookup" match="row" use="concat($TRANSFORMER_SourceCountry,'_layer_name')"/> any more useless than?: <xsl:key name="lookup" match="row" use="US_layer_name"/> The first one uses a constant key value. If it were legal syntax (which it would be if the explicit comment disallowing variables had not been added to the spec) and if $TRANSFORMER_SourceCountry were 'US' then <xsl:key name="lookup" match="row" use="concat($TRANSFORMER_SourceCountry,'_layer_name')"/> would be <xsl:key name="lookup" match="row" use="'US_layer_name'"/> ie every row gets the same key value 'US_layer_name' Thus you couldn't use this key to get any subset of the row elements, just all of them at once, in which case there's no need for a key at all you could just use <xsl:variable name="x" select="//row"/> The second one uses a non-constant Xpath. each row gets the value of the US_layer_name element which is the child of that row, so different rows potentially get different keys, and you can use xsl:key to quickly find the rows with any particular key value. David _____________________________________________________________________ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service. XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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