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The recommended use of prefixes and namespaces is that these entities should be declared on the first element of that namespace. This prevents "operational diffiulties", as described in http://www.w3.org/TR/REC-xml-names/#ns-using.
"Using prefixes may lead to operational difficulties in the case where the namespace declaration attribute is provided, not directly in the XML document entity, but via a default attribute declared in an external entity."
Example of the recommended use of prefixes and namespaces.
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\\ *According to the proclamation in the same document (\[*http://www.w3.org/TR/REC-xml-names/#ns-using*|http://www.w3.org/TR/REC-xml-names/#ns-using]), the DARE agreement will be that it is also possible to declare prefixes and namespaces in the ancestors of the document.\* |
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Example of the optional , but not recommended uses of prefixes and namespaces.
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