DOM Level 3 supports namespaces in the same way as DOM Level 2, except that it adds a few new methods and supports version 1.1 of the Namespaces in XML recommendation. The most important new method is Document. NormalizeDocument which, among other things, cleans up namespace declarations.
Thus, it is no longer necessary to explicitly add namespace declarations (xmlns attributes). Instead, you can call Document. NormalizeDocument and the DOM implementation will do it for you.
(Exactly what is done depends on a number of configuration parameters. More.
This depends on what DOM level 1 implementation you are using. If you are using a namespace-aware DOM implementation, such as those from Data Channel (Microsoft), IBM, Oracle, or Sun, then all you need to do is use the methods provided by those implementations to retrieve the URI and local names. More.
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