Namespace Prefix

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Within XML documents, it sometimes becomes necessary to differentiate one element from another based on the context in which these elements are used.

For example, the <table> element is used differently between XML and HTML. Within an XML document in which both XML and HTML <table> elements are present, namespaces and prefixes can be used to differentiate XML table elements from HTML table elements.

Namespaces identify the context in which a given element is used, thereby differentiating that element from otherwise-identical elements.

Theoretically, any label can be used as a namespace, but XML namespaces should be URIs. Ideally, an XML namespace is an HTTP-capable URI that dereferences to a web-accessible description of the context identified by the namespace. Consequently, most XML namespaces in common use look like standard web addresses.

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Defining Namespaces

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