Subject: Re: [xsl] Optimization using keys From: David Carlisle <davidc@xxxxxxxxx> Date: Wed, 16 Feb 2005 12:52:55 GMT |
> I'm afraid i don't understand what you're saying. Is it that if i want > to use keys i can not use document()? no but the usage is different and it would be a waste of time to explain one use if you want another. You only have one document so you can just delete all document() calls. then a key is just a way of looking up certain nodes more quickly. First tell the system to remember them, indexing on the Menu_K child: <xsl:key name="m" match="Menu" use="Menu_K"/> Then in any Xpath expression you can use key('m',wibble) which means the same as //Menu[Menu_K=wibble] except it is typically much faster as the system doesn't have to search the whole document every time: it looks them up in some kind of internal lookup table. so <xsl:apply-templates select="document('')//Menu[Menu_K=current()/MenuData]/Filhos/Menu" mode="copia"/> becomes <xsl:apply-templates select="key('m',MenuData)/Filhos/Menu" mode="copia"/> which is less to type and faster to execute. David ________________________________________________________________________ This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________
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