This method is intended for internal use only. @param useMaps the expanded use-character-maps property: a space-separated list of namesof character maps to be used, each one expressed as an expanded-QName in Clark notation (that is, {uri}local-name). @param sf the SerializerFactory - used to create a CharacterMapExpander @return a CharacterMapExpander if one is required, or null if not (for example, if theuseMaps argument is an empty string). @throws XPathException if a name in the useMaps property cannot be resolved to a declaredcharacter map.
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