[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Are we losing out because of grammars? (Re: Schema ambiguitydetecti
So essentially, if one has a reasonably large system that must either push or pull data from agency to agency, tool to tool, one should expect now and in the future to write and standardize multiple descriptions of that data to enable validation of both co-constraints and grammar? Consider, these are some very long pipelines from local agencies to say, government repositories. Data modelers are part of this problem, but at the more serious level of costing delivery and calculating the dependencies of the processes on the validity of the data, the modeler may be a trivial part of the cost. It is like the DePH for XML; a myth by which we simplified by not really the model for the cost. Len Bullard Intergraph Public Safety clbullar@i... http://www.mp3.com/LenBullard Ekam sat.h, Vipraah bahudhaa vadanti. Daamyata. Datta. Dayadhvam.h -----Original Message----- From: James Clark [mailto:jjc@j...] Joe English said pretty much everything I wanted to say. Just one additional comment. Rick Jelliffe wrote: > doesn't the presence of these tricky ambiguity issues > mean that to actually understand RELAX (and presumably certain other schema > languages) requires a computer scientist not a data modeler? If you're using RELAX for validation, it doesn't have any ambiguity issues. In this regard it is the same as TREX. The ambiguity issues only arise if you try to use it to "interpret" the document (that is augment the information in the document by assigning each element or attribute a label corresponding to some rule in the schema). If you just stick to validation, there's no issue. I would agree with the sentiment that it's bad to inflict tricky ambiguity issues on data modelers. Fortunately this is not inherent in using grammars for validation.
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