transform seem to contain the available tranformations that can be peformed with dbms_metadata. dbms_metadata allows to configure transformations with dbms_metadata.add_transform and dbms_metadata.set_transform_param. select -- count(*), transform from sys.metaxsl$ group by transform order by transform; -- -- ALTERDDL -- ALTERXML -- DDL -- EDITIONING_VIEW -- MODIFY -- MODIFYSTREAMSXML -- MODIFYSXML -- PARSE -- REDEFINITION -- STREAMSXML -- SXML -- SXMLDDL