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Message: [QUOTE="Joe Kesselman, post: 2024178"] Namespace Nodes are an XSLT/XPath concept. Basically, they're the declarations in scope at a given node. The normal copy-a-node-from-source-to-result mechanisms in XSLT (xsl:copy) conceptually copies these along with the nodes, helping to ensure not only that all namespaces used in node names are properly defined, but that those in text content (for example, in XPaths that are part of the content being processed) have their necessary info. See the XPath spec's description of the namespace:: axis, and XSLT's description of how namespace nodes are handled. If you're hand-coding the copy process, it's up to you to either do this sort of copying -- determine which declarations are in scope and explicitly declare them in the output document -- or to have your serializer regenerate them when you discover that a namespaced node has a prefix that isn't already declared with that value at this point in the document. [/QUOTE]