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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Fast text output from SAX?
 At 6:58 AM -0700 4/15/04, Jeff Rafter wrote: >Agreed, well-formednes must be checked. But surely it doesn't need to be >checked every time a document is parsed (if it is unchanged). I think there >is definitely room for a parser that can emit SAX events (or something) >without bogging down in Wellformedness checks. For example, if a document is >received from a partner, wellformedness is checked, and then pushed into a >database text field for later processing, there is no need to recheck >wellformedness. How do you know no other process or person has modified the field in the mean time? > In fact, when it is parsed again later, there is no need to >do a lot of things-- like check end tags-- if wellformedness is known a >priori the start tag can be pushed onto a stack, and popped when </ is read. >Then the "parser" can simply skip the length of the end tag. There are lots >of savings like this-- duplicate attribute checking for example can be >costly-- but would be unnecessary if wfness was assumed. But well-formedness can't be assumed. That's the core of XML. -- Elliotte Rusty Harold elharo@m... Effective XML (Addison-Wesley, 2003) http://www.cafeconleche.org/books/effectivexml http://www.amazon.com/exec/obidos/ISBN%3D0321150406/ref%3Dnosim/cafeaulaitA 
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