Subject: Re: [xsl] concatenating 1-n XML files From: Joseph Kesselman <keshlam@xxxxxxxxxx> Date: Tue, 12 Nov 2002 11:02:30 -0500 |
> 1. Can I use the document() function with wildcards in the doc-name ? > something like: <xsl:for-each select="document('name*.xml')"> ? Nope. Document expects a URI as its input, and URIs don't have the concepts of multiple files or wildcards. What you could do is develop a list of files first (perhaps using extension functions to scan the filesystem to fill in the wildcards, or perhaps computing that list before you start the stylesheet and passing it in) and then iterate through that list, using document() to retrieve each one. > 2. would a large number of files (000's) have an adverse effect > on performance ? Or once a document is processed is it retained > in memory or released ? Is there an upper limit of elements that > can be processed ? I'll be using xalan. Implementation dependent. I believe Xalan currently caches documents in case you refer to the again, so this would burn memory; I can't vouch for other processors. There's been discussion of making the memory management more controllable and/or smarter, but I don't think those ideas have made it into the code yet. (I may be wrong; it's been a while since I've dug into that corner.) If the documents are small enough, Xalan might be able to handle them all at once. Storage allocation is a bit weird in Xalan-J, but theoretically we could handle up to 2^16 documents at a time as long as no one of them is larger than 2^16 nodes; larger documents occupy multiple "DTM ID" slots and thus cut into the number of documents available. Realistically, you'll run out of memory long before you run into this barrier. > other suggestions Process the documents individually to extract just the info you need, then do a merge on the resulting smaller documents? If it's really thousands of documents, you might want to consider a hardcoded SAX solution. Or -- again -- a SAX preprocessing stage to select what you need and merge it into a single document, which would then be styled. ______________________________________ Joe Kesselman / IBM Research XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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