Validating xml data

Most validation methods are concerned with the vocabulary and grammar of the XML document.

XML’s built-in validation mechanism is the Document Type Definition (DTD).

If you’re in the retail business, for example, a SKU data type could be used in many product-related schemas.XML Schema supports rudimentary inheritance for complex types, allowing derived types to extend or restrict base types.Here is a sample XML instance document that references an XML Schema: ).You can also use regular expression patterns to build just about any kind of text data type you can imagine.The following schema fragment illustrates defining a data type for social security numbers using a regular expression pattern.

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