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Re: xxRe: [xsl] efficient use of key element and function
Subject: Re: xxRe: [xsl] efficient use of key element and function From: Manfred Staudinger <manfred.staudinger@xxxxxxxxx> Date: Wed, 7 Sep 2005 18:09:27 +0200 |
In my real stylesheet I have 1500 names and about the same number of uses for key(). The names represent files and are used to avoid a file-not-found for doc(). They are retrieved by means of collection() and for each "not-found" a new file will be created. I would like to thank you especially for your explanations which helped me a lot! Regards Manfred On 9/7/05, David Carlisle <davidc@xxxxxxxxx> wrote: > <xsl:key name="find" match="name" use="text()"/> > Is this the best (most efficient) solution? > > If you only use the key a small fixed number of times, then it's > probably not worth using a key at all (it may be, you'd need to do > timings to check) the system has to traverse the entire tree to build > the key table and take memory and time to build the table. If you are > going to make lots of accesses to find different name elements (as in > repeatedly for each of thousands of input elements) then building the > key index is definitely worth it, but if it is just for a small number > fixed in the stylesheet then probably not. > > especially in use such as > > <xsl:value-of select="empty(key('find', 'prunauer_regina', $Index-alt))"/> > > > as here you are interested just if there is any such node, so you don't > need to traverse the whole tree at all you can stop as soon as you find > one, so I'd not use a key at all and just do > > select="empty(//name[.='prunauer_regina'])" > > but it depends whether your real case really is like this or whether > it's just over simplified while generating a small example to post. > > 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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