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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] performant templating language for XML
 Hi. I'm going to ask the following question: Is there a good templating language that can be used to build a high demand website from a collection of XML documents? My assertions are going to be that XSL is not performant, that XQuery is not a templating language, and that no other well established language exists for creating web pages out of XML documents. I would very much like to see any or all of those assertions contradicted. The influence of recent threads on this post is going to be obvious, at the same time previous threads have left some fundamental questions unanswered. Let me give a little more background about the problem we're trying to solve: We have a publishing system holding a great number of (sometimes on the large side for web use) XML documents. The system is capable of generating additional meta data in XML format. We are pretty well committed to serving pages from a java servlet container. Each request requires one main transform where the XML is up to 80k (very occasionally very much larger, but those larger cases might be able to be pre-rendered), and up to two additional transforms on <10k docs. We're looking at peaks of 10 users per second. Assume that we have some ability to distribute this load among multiple servers but assume that this ability is limited in arbitrary but often constraining ways. Now on to my assertions: *** XSL is not performant When answering requests, a templating language that forces the document in its entirety to be held in memory quickly hits load limits. My understanding is that XSLT either cannot be streamed or current implementations are not optimized to stream when appropriate Initial tests seem to show that XSL is a no-go in the load environment outlined above. Does anyone have production experience that would argue that XSL can be viable at these rates and that we should be looking harder for optimization strategies? *** XQuery is not a templating language I have no idea if I'm going to encounter disagreement with this idea or not. Everything I've seen of XQuery suggests that the results of a query could be sent to a formatting engine that would apply a template to them, but not that XQuery would in itself be used to apply formating to a document. I know that a previous thread asserted that XQuery can technically do anything XSL can do, but using it as a templating language looked to me like lining up camels and needles in an un-fun way. *** There is no other well established templating language for formatting XML into web output This isn't entirely true, we have looked at some other alternatives. Jsp with DOM methods, [expletive deleted] in comparison to XSL. Anakia, yet another step down. DVSL... don't get me started. The most likely contender has ended up being: pre-render the main contents using XSLT on the docs within the content management system and cache and serve up the results. In conjunction have a lightweight run time templating language to do navigation, authentication, and other aspects of UE that need run time processing. Other options gratefully considered! Thanks in advance! -------------------------->Nathan .:||:._.:||:._.:||:._.:||:._.:||:._.:||:._.:||:._.:||:._.:||:._.:||:._.:||:. 
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