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> When we receive the data (the xml message) we need to check the structure > (is the message valid according to the schema) but we also need to > implement particular business rules. For exemple, a field A in the message > is required if, and only if, the value of some other field B in the message > is defined in a extrnal list of values. The DTD (and schema) can only > prescribe that the field A is optional since we cannot know in advance what > will be the content of the other fields (B in this example). > Is there some rules, standard architectures or good practices to use ? It Sounds like a prime case for using xlinkit (http://www.xlinkit.com)! particularly if you need to check constraints between different documents.. like your externally defined values. Also, have a look at Schematron (google) for single document validation. Christian
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