def clear_source(self):
if (self.get_source_metadata().is_read_only() or<EOL>self.get_source_metadata().is_required()):<EOL><INDENT>raise NoAccess()<EOL><DEDENT>self.my_osid_object_form._my_map['<STR_LIT>']['<STR_LIT:source>'] =self._source_metadata['<STR_LIT>'][<NUM_LIT:0>]<EOL>
stub