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Bullard, Claude L (Len) schrieb: >This one is fun. I know that a validating editor >can use a schema or DTD to create a valid file. > >Can a program do this for files it creates dynamically? >Are there examples of this? > does she code lisp? if so, one way to do it is with a method combination for generic function-based implementation of the serialization mechanism. the method combination implementation uses the type of the data instance to be encoded and the content specification of the target-encoding to write the requisite effective encoding method on-the-fly. the runtime cost is rather low, as the effective methods is generated once and compiled. the only necessary overhead is one level of function invocation compared to hand-coded in-line generation, but that's minor. i recall reading about efforts in a similar direction in haskell, but my knowledge of that is just second-hand. ... > >This question came from a programmer who doesn't want >to hardwire the structure of files she creates into >the code that creates them. I had replied with validation >on input (create the file, validate it then), and what >she actually wants to do is use the schema to drive >the file builder using say, SAX or its analog. Mainly, >she doesn't want to rewrite the code when new versions >of the document inevitably occurs. She just wants to >modify the schema. Works for editors but of course, >they run in human time, but other than performance, I >can't think of a reason WHY she couldn't do it. > >What about it? > >len > >----------------------------------------------------------------- >The xml-dev list is sponsored by XML.org <http://www.xml.org>, an >initiative of OASIS <http://www.oasis-open.org> > >The list archives are at http://lists.xml.org/archives/xml-dev/ > >To subscribe or unsubscribe from this list use the subscription >manager: <http://www.oasis-open.org/mlmanage/index.php> > > > >
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