[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: How should I structure a huge XSLT dataset best?
On Monday 29 September 2003 21:32, Anthony Zawacki wrote: > The lack of obvious precendence for this type of work makes it > much more difficult. I'm used to being able to search the > list or looking at the XSLT FAQ and seeing easy solutions, but > this type of issue doesn't seem to have been addressed in the > past. Or am I missing something? We have a client that has a similar setup, large data sets contained in the stylesheet. They typically store the data in a variable and access it directly from there. The problem with this approach is that the processor will normally bind the variable to this data by creating a result tree fragment from its contents at runtime. For large data sets this can be expensive. Our processor can recognise if the variable content is constant and if so it effectively binds the variable at compile time eliminating this problem. A more general solution is to just put your data in the stylesheet as a child of the <xsl:stylesheet> under a different namespace. In which case you can access it via a document('')/xsl:stylesheet/mydata:data type XPath. If the data is to be imported from a second stylesheet you would need to use its name in the document() function. The performance of this technique relies on the processor keeping the stylesheet object model(s) in memory after compilation and recognising that you are referring to the same document. This is not always true but most processors appear to work that way. As to the structure of your data, is this not a search problem a trie is ideally suited to. If this is the case you may be able to generate XSLT to perform the search directly without the need for a data table. Trie's can be encoded into a set of nested switch statements triggering on each character in the test string. This is most likely the quickest solution and avoids the issues of the other options above. Regards, Kev. XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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