code: def query(cls, file, offset=None, limit=None, api=None):
          
          api = api if api else cls._API
  
          file = Transform.to_file(file)
          return super(Marker, cls)._query(
              url=cls._URL['query'], offset=offset, limit=limit,
              file=file, fields='_all', api=api
          )
docs: Queries genome markers on a file.
          :param file: Genome file - Usually bam file.
          :param offset: Pagination offset.
          :param limit: Pagination limit.
          :param api: Api instance.
          :return: Collection object.