Montreal supports v11, v12, v13, v14, v15, v16, v17, v18, v19, v20, v21, v22, v23, v24, v25, v26, v27,v28,v29 of the API. v29 is the preferred version.
Latest Files can always be found in gerrit: https://gerrit.onap.org/r/gitweb?p=aai/schema-service.git;a=tree;f=aai-schema/src/main/resources/onap