@hep2marc.over('<STR_LIT>', '<STR_LIT>')<EOL>@utils.for_each_value<EOL>def document_type2marc(self, key, value):
if value in DOCUMENT_TYPE_REVERSE_MAP and DOCUMENT_TYPE_REVERSE_MAP[value]:<EOL><INDENT>return {'<STR_LIT:a>': DOCUMENT_TYPE_REVERSE_MAP[value]}<EOL><DEDENT>
Populate the ``980`` MARC field.