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Attribute: namespace (of element <element>)

Standard excerpt:

If the namespace attribute is present, then it also is interpreted as an attribute value template. The string that results from instantiating the attribute value template should be a URI reference. It is not an error if the string is not a syntactically legal URI reference. If the string is empty, then the expanded-name of the element has a null namespace URI. Otherwise, the string is used as the namespace URI of the expanded-name of the element to be created. Examples (xslt:xml): Overview
22:6 23:6

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