ObsCore 1.1: Erratum 1

Author: DM WG

Date last changed: 2019-05-10 Update of errata page after tcg review . L. Michel , M.Louys.

Previous change : 2018-12-19

Date accepted:

Rationale

This erratum corrects a few issues noted in the ObsCore-1.1 document .

1. Table 6 page 56 and table 7 page 58, list invalid UCD strings for certain elements (invalid with respect to the UCD1+ standard) in obstap columns definition.

• obs_publisher_did: UCD = meta.ref.uri;meta.curation
  • The problem being that meta.curation is a primary word (P) being used as secondary. meta.ref.uri is indifferent (Q)
• publisher_id: UCD = meta.ref.uri;meta.curation
  • Same as obs_publisher_did
• o_stat_error UCD = stat.error;phot.flux
  • The issue here being that the addition of phot.flux is too specific for the usage.
• dataproduct_type and dataproduct_subtype : UCD = meta.id in the REC ObsCore1.1
  • The problem is that meta.id is more appropriate for an identifier while here we consider a class of products ; meta.code.class should be preferred
  • The example serialisation described in section C.3 had a bad meta.id;class UCD for dataproductype .
  • This must be corrected in the example presented in C.3

Erratum Content

Invalid UCDs in Table 6 page 56 and table 7 page 58: TAP_SCHEMA.columns

Original Wording (Invalid UCDs)

• obs_publisher_did: UCD = meta.ref.uri;meta.curation
• publisher_id: UCD = meta.ref.uri;meta.curation
• o_stat_error: UCD = stat.error;phot.flux
• dataproduct_type: UCD = meta.id
• dataproduct_subtype : UCD = meta.id

New Wording (correct UCDs)

• obs_publisher_did : UCD = meta.ref.ivoid
• publisher_id: UCD = meta.ref.ivoid
• o_stat_error: UCD = stat.error
• dataproduct_type: UCD = meta.code.class
• dataproduct_subtype: UCD = meta.code.class

Impact Assessment

• ObsCore clients normally use column names or perhaps utypes to identify data model members. The change of the UCDs proposed here should not impact them.
• Clients not aware of ObsCore will profit from the proposed change; for obs_publisher_did and publisher_id, they will no longer produce diagnostics for invalid UCDs, and for o_stat_error they will not be mislead any more.
• This change may rise Taplint warning messages.

Notes

1. The proposed changes are in the errata proposed document attached here REC-ObsCore-v1.1-20190510_errata.pdf

2. It has been proposed, in this erratum, to extend the use of obs_publisher_did to others IDs than ivoids (DOI e.g.).
   Answer: Changing the role of an identifier is out of the scope of an errata. This issue could be discussed for Obscore 1.2.