XML Schema by Vlist Eric van der

Author:Vlist, Eric van der [Eric van der Vlist]
Language: eng
Format: epub
Tags: COMPUTERS / Programming Languages / XML
ISBN: 9781449315375
Publisher: O'Reilly Media
Published: 2011-07-25T16:00:00+00:00

Tip

This example shows that the impact of both derivation types on the applications is very different. A type substitution by restriction has virtually no impact on the applications, since the content model matching the restricted type must also match the original type. Alternatively, a type substitution by extension allows content models not allowed by the original type (such as the addition of the book element in the previous example), and the risk of breaking applications that do not expect these additions is higher. Thus, a conservative attitude might be to include extension in the default values of block in your schemas.

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