__init__ ( self,  callback )

add_feature_qualifier ( self,  fq )

add_location (
        self,
        style,
        location_info,
        )

end_feature ( self,  tag )

end_feature_block ( self,  tag )

end_feature_description ( self,  tag )

start_feature (
        self,
        tag,
        attrs,
        )

start_feature_block (
        self,
        tag,
        attrs,
        )

start_feature_description (
        self,
        tag,
        attrs,
        )