Minutes DAL1, Beijing, 14-May-2007, 16-17:30 + follow-up session 18:40-19:45 Chair DAL1: D. Tody Moderator of follow-up: Roy Williams Minutes: M. Dolensky DAL Session Page and Presentations http://www.ivoa.net/twiki/bin/view/IVOA/InterOpMay2007DAL DAL1 session: ============= I) SSA Protocol Update [Tody] about POS: assuming ICRS for cood1,coord2; is not sufficient - need to support solar astronomy, for instance Comments: - picking subset from STC - requires common approach for all access protocols - support of additional coordinate systems should be optional suggestion to add WAVECALIB similar to FLUXCALIIB - stepping through large queries would require stateful protocol and hence MAXREC is chosen for V1.0; omitting MAXREC means potentially all records are returned - IVOA Exec requests agreement on SSA standard this week - clarification: Field ID column in (https://webtest.aoc.nrao.edu/ivoa-dal/ssap-keywords.xls) are short names for UTYPEs that could be used in an application and are not part of the standard - brief discussion on VOTable serialization and name vs. utype attribute; approach is subject to outcome of respective VOTable session II) getCapabilities Proposal and Issues [Tody] - Q: Why is info pulled from service to registry rather than it is pushed to the registry? A1: registry can get update whenever it wants to; doesn't need to wait for a trigger A2: push is safer: error- and security-wise III) Defining VO Extensions for DAL Protocols [Plante] Q: Is getCapabilities required for SSA V1.0? Comments: - Issue is scope of getCapabilities and dependency on onther WGs. One could decouple this issue from SSA V1.0 to get agreement this week. - Already registered SSA services would be invalidated if FORMAT=METADATA is invalid. - VOSI requires a getCapabilities method. - FORMAT=METADATA is well established but it would be a missed opportunity if getCapabilities is dropped. Given the unresolved debate it was decided to continue the discussion about the inclusion getCapabilities in SSA V1.0 in a dedicated ... Follow-On Session ================= Room #5, 18:40 - 19:45 Moderator: Roy Williams, IVOA Technical Lead About 25 persons still present, among them both editors, 5 authors of the SSA draft, IVOA Exec chair and deputy, 3 more members of the Exec, the group chairs of DAL, Registry, VOQL, Curation, GWS, Theory, VOEvent. After hearing all parties and extensive and exhaustive discussion the suggestion of the Registry chair person (Ray Plante) was accepted as the way forward: 1. The definition of method GetCapabilities will be split off and specified in a separate document. 2. Method GetCapabilities will be added as an additional interface in a future version; this will be explained in the document. 3. The meta data mode (FORMAT=METADATA) a la SIA V1.0 will be taken over in SSA V1.0; M. Dolensky tasked to update document The DAL WG was tasked to agree on the remaining issues of WD SSA V1.0 during the meeting this week and to submit the PR version for RFC within the month of May.