Subject: Re: [xsl] Optimization using keys From: António Mota <amsmota@xxxxxxxxx> Date: Wed, 16 Feb 2005 13:33:10 +0000 |
Wow, the execution time drop to less than a half the time... I think i'll check the literature to know more about keys... Too bad i can't just sit and learn for awhile. Many thanks, David. On Wed, 16 Feb 2005 04:53:18 -0800 (PST), David Carlisle <davidc@xxxxxxxxx> wrote: > > > 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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