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XML in Office 2003: Information Sharing with Desktop XML by Priscilla Walmsley, Charles F. Goldfarb

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Chapter 16. Namespaces Friendly Tutorial

  • Unique names

  • URI-based namespaces

  • Attributes with namespaces

The Namespaces in XML specification is an extension to XML that answers the burning question: Are we talking about the same subject?

Since anyone can define element-type names, and elements from different documents can be mixed together, we need a way to clearly separate our names from other people’s names. We need to have different so-called namespaces.

We do this in the real world all of the time.

What would you do if you needed to refer to a particular John Smith without confusing him with any other John Smith. You qualify the name: “John Smith from London”. That sets up a namespace that separates Londoners from everyone else.

If that isn’t sufficient ...

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