Needs["XML`"] XML with explicit namespace information: ToCompactXML suppresses redundant namespace information for elements. Attributes in the null namespace always get compacted, regardless of the setting of "AttributesDefaultNameSpace":
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Attributes in the same default namespace as the element only get compacted when "AttributesDefaultNameSpace" is "ElementNameSpace".
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Attributes in other namespaces do not get compacted:
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If the namespace of a tag is explicit but different from the default, attributes will not be compacted:
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The default namespace may be inherited from containing tags:
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EXAMPLES
Basic Examples 
