regarding ALTTYPE [was RE: vo-dml in votable]

[gerard.lemson@gmail]

I also think Mark's proposal is very sensible.
Gerard

> -----Original Message-----
> From: dm-bounces at ivoa.net [mailto:dm-bounces at ivoa.net] On Behalf Of
> Laurino, Omar
> Sent: Wednesday, March 11, 2015 10:34 AM
> To: Mark Taylor
> Cc: IVOA Applications WG; <dm at ivoa.net>
> Subject: Re: regarding ALTTYPE [was RE: vo-dml in votable]
> 
> Hi Mark,
> 
> 
> 
> On Wed, Mar 11, 2015 at 8:39 AM, Mark Taylor <m.b.taylor at bristol.ac.uk
> <mailto:m.b.taylor at bristol.ac.uk> > wrote:
> 
> 
> 	Regarding Omar's suggestion of a modified 4c
> 	with multiplicity 0..1, I would argue that this additional
> 	multiplicity restriction ought not to be written into the VOTable
> 	schema/standard itself; it would be very annoying to have to
> 	issue VOTable 1.5 one day just in order to change the value
> 	of a maxOccurs xs:element qualifier.
> 
> 
> 
> I agree, I just meant we should start prototyping with a solution that could easily
> be turned into the other, before we finalize the new version of the standard. I
> expect prototypes to inform more decisions other than TYPE's multiplicity, and
> this is actually already happening as we update the old implementations based
> on UTYPEs. It was decided to update VOTable, it would be unwise not to change
> it with a well-thought solution.
> 
> Thanks,
> 
> Omar.
> 
> 
> 
> 	Following that reasoning the VOTable (1.4?) standard could just
> 	define the elements VODML, TYPE and ROLE (multiple TYPEs allowed)
> 	without too much description of their semantics or usage, and point
> 	to the VODML mapping document for the details; that mapping
> document
> 	could then supply additional requirements or advice about TYPE
> 	multiplicity.  VOTable could then be somewhat insulated against
> 	future changes in the requirements or usage patterns of VODML
> 	metadata.
> 
> 	Mark
> 
> 	--
> 	Mark Taylor   Astronomical Programmer   Physics, Bristol University, UK
> 	m.b.taylor at bris.ac.uk <mailto:m.b.taylor at bris.ac.uk>  +44-117-
> 9288776 <tel:%2B44-117-9288776>   http://www.star.bris.ac.uk/~mbt/
> 
> 
> 
> 
> 
> --
> 
> Omar Laurino
> Smithsonian Astrophysical Observatory
> Harvard-Smithsonian Center for Astrophysics
> 100 Acorn Park Dr. R-377 MS-81
> 02140 Cambridge, MA
> (617) 495-7227