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---+ Embedding STC in VOTable At the Garching Interop, [[http://www.ivoa.net/internal/IVOA/InterOpNov2009DM/stcvotable-demleitner.pdf][Markus has uttered some gripes]] with [[http://www.ivoa.net/Documents/Notes/VOTableSTC/NOTE-VOTableSTC-1.1-20090612.pdf][version 1.1-20090612 of the STC in VOTable Note]] specifying how to embed STC in VOTables. There's been quite a bit of work going on since then; older items have been moved to STCInVOTableArchive, which doesn't necessarily mean the issues are settled; if something discussed there still bugs you, feel free to resurrect it here. ---++ Draft of 2010-04-20 I've put up a new draft at http://vo.ari.uni-heidelberg.de/docs/note_stc_20100420.pdf. This is basically a rewrite (while, I believe, maintaining the spirit of the old note). Below, I've opened up Level 3 discussion spaces for what I believe a the most sweeping changes against the ''previous draft'' (not the current version of the note; see STCInVOTableArchive for the other changes). -- IVOA.MarkusDemleitner - 20 Apr 2010 ---+++ Change: One group MD: Rather than having one !AstroCoordSystem and one !AstroCoord group per system, all utypes dealing with one coordinate system is now contained in one group of (typically) utype stc:ObservationLocation. While this means you can no longer re-use coordinate system definitions within a VOTable, I believe the advantages in implementation simplicity far outweigh this drawback. ---+++ Change: !AbsoluteTime substitution group gets yet another special treatment MD: STC-X unfortunately has the !AbsoluteTime substituion group that gives what in VOTable is xtype's job (and even if that weren't so, having serialization details in utypes is a pain anyway). So, a new special rule was inserted into the utype generation algorithm to divert ISOTime, JDTime and MJDTime into some special utype, and there's a recommendation to drop that particular utype. Nasty special-casing all over the place, but all alternatives (some of which are discussed in STCInVOTableArchive, search for xtype) seemed worse to me. ---+++ Change: !DataModel.URI MD: Many people want some versioning of the data models, preferably connecting data models to URLs. After some consultation with Mireille, I propose to transmit this URL in !DataModel.URI. It doesn't help to make instance documents much prettier but is IMHO a rather non-invasive method of making explicit what data model was used. <!-- * Set ALLOWTOPICRENAME = %MAINWEB%.TWikiAdminGroup -->
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Topic revision: r21 - 2010-04-20
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MarkusDemleitner
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