should a new xmlns="" default be added, if so Some(String)
prefix -> namespace (these should be declared for a given element)
prefix -> namespace
A NamespaceContext represents the prefix->namespace mappings for a given elements children. It is only valid for the time of serialization (or comparison).
prefix -> namespace
prefix -> namespace (these should be declared for a given element)
should a new xmlns="" default be added, if so Some(String)