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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 9:00 AM -0400 4/16/04, Stephen D. Williams wrote: >Binary doesn't imply there isn't any well-formedness checking, obviously. For once I agree. Obviously, binary doesn't imply that. However, in practice, the binary formats I do see rarely do as much well-formedness checking as a parser does, either in the XML domain or elsewhere. Speed gains that come from eliminating well-formedness checking should not be attributed to a binary format. Similar gains can be had by eliminating well-formedness checking when processing real XML (Not that I recommend doing that of course). >Incremental, or lazy evaluation, well-formedness is useful and >potentially protects applications just as well as full >well-formedness with better efficiency. Simply not true. It doesn't come close to protecting applications as well as full checking. >Allowing the application the option of avoiding repetitive or >unncessary well-formedness checking is a valid strategy. Your >argument that data that a 'program' receives must always be fully >validated in any situation could just as easily be extended to >libraries and modules receiving DOM references or similar. What one >system may do with libraries or software modules, another may do >with plugins and another may do with n-tier processing steps. Does >the granularity of the implementation somehow necessarily change the >fundamental likelihood of corruption? All published interfaces should verify their preconditions. Libraries should (and indeed the ones I write do) verify that input passed to them from outside the library is correct. For instance, if I publish an interface that expects a DOM object that can be serialized as namespace well-formed XML, and you pass me a DOM object that can't be, then the precondition is violated. The method should detect this and throw an exception. And indeed this is exactly what I do: http://www.cafeconleche.org/XOM/apidocs/nu/xom/converters/DOMConverter.html#convert(org.w3c.dom.Document) Cowboy coding like you suggest scares me. I certainly wouldn't want to have to trust any software written to such standards. Regrettably I know there's a lot of such software out there, which is more reason than ever for my software to be very careful about what it receives from your software. -- 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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