prefix() public

Returns the namespace of the attribute. 

 e = Element.new( "elns:myelement" )
 e.add_attribute( "nsa:a", "aval" )
 e.add_attribute( "b", "bval" )
 e.attributes.get_attribute( "a" ).prefix   # -> "nsa"
 e.attributes.get_attribute( "b" ).prefix   # -> "elns"
 a = Attribute.new( "x", "y" )
 a.prefix                                   # -> ""
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