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   Re: power uses of XML vs. simple uses of XML

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  • From: "KenNorth" <KenNorth@email.msn.com>
  • To: "XML-Dev Mailing list" <xml-dev@xml.org>
  • Date: Sun, 9 Jul 2000 10:38:48 -0700

> Schemas are only useful in some situations: many XML applications
> built today already have data validation in them (in code).

You've just pointed out an important reason to use schemas -- to minimize ad
hoc validation by application code.

Consider a scenario where you have multiple applications operating on a
single document type. If there is a schema for that document, and all
applications use the schema, there is uniform application of rules.
Validation is consistent (at least for rules that are definable by a

On the other hand, if you do application-level validation, the logic must be
duplicated across n programs. This presents a versioning problem. When there
is a rule change, you must do n updates to source code, instead of updating
a single schema.

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