Haven't heard any response to this message suggesting an alternative
means
of concatenating UCDs to permit their parsing by an XML parser. Here's
a
forward to make sure you all got it.
No, we don't yet have UCD's operating under a schema, but we might want to some day and it will be much less painful if we make the switch now.
As far as I can tell, there's no obivous reason for the present choice
of
separator.
Rick
> Up until now, it hasn't been possible to check the syntax of a UCD
> list using
> XML Schema: there's no way (yet) to express a list of elements
> separated by
> semi-colons. This is a shame, since it means that somebody else has
> to do
> this work - work which could have been delegated to the XML parser.
>
> Fortunately, XML Schema recognizes lists of elements separated by white
> spaces, i.e. not
>
> "phot.calib;src.class"
>
> but
>
> "phot.calib src.class"
>
> If the official syntax of UCD lists included the latter possibility,
> then the
> entire content of a VO XML document could be parsed at once in a single
> pass.
>
> Yes, it's too late for VOTable, but many other schemata are still in
> their
> infancy and would benefit dramatically from this possibility. While
> the use
> of UCD in VOTable has - up to now - been mostly in the form of
> documentation,
> VOEvent needs to be able to permit direct interpretation of the
> meaning of
> elements identified by UCD's (e.g. your robotic telescope only wants
> to look
> at GRB's and not vanilla SN). Either all subgroups like VOEvent wil
> be forced
> to define their own ontology or we enable all VO schemata to be able
> to interpret
> UCD's directly without any extra effort. The present syntax prevents
> this.
>
> Schema examples of how this might work can be found at
>
> http://monet.uni-sw.gwdg.de/twiki/bin/view/VOEvent/
> SchemaContentUCDListType
>
> (for the formal UCD list element type) and
>
> http://monet.uni-sw.gwdg.de/twiki/bin/view/UCD/SchemaContentUCD
>
> for an example of the current UCD placed in a schema which could be
> concatenated in a UCD list element.
>
> In the short term, we can easily afford to let the two forms exists
> side by side
> (well, VOTable uses the old syntax, and new ones like VOEvent use the
> newer
> one). Those who have added parsers to read the old UCD lists will
> easily be
> able to adopt their code to read the new format, and those of us still
> working on
> the first versions of VO schemata can immediately benefit from being
> able to
> parse the ENTIRE document.
>
> F. Hessman
> C. Hettlage
>
> -----------------------------------------------------------------------
> -------------------------
> Dr. Frederic V. Hessman Hessman-at-Astro.physik.Uni-Goettingen.DE
> Universitaets-Sternwarte Tel. +49-551-39-5052
> Geismarlandstr. 11 Fax +49-551-39-5043
> 37083 Goettingen http://www.uni-sw.gwdg.de/~hessman
> -----------------------------------------------------------------------
> --------------------------
> MONET: a MOnitoring NEtwork of Telescopes
> http://monet.uni-goettingen.de
> -----------------------------------------------------------------------
> --------------------------
>
>
Dr. Frederic V. Hessman Hessman-at-Astro.physik.Uni-Goettingen.DE Universitaets-Sternwarte Tel. +49-551-39-5052 Geismarlandstr. 11 Fax +49-551-39-5043 37083 Goettingen http://www.uni-sw.gwdg.de/~hessman ------------------------------------------------------------------------ -------------------------
http://monet.uni-goettingen.de ------------------------------------------------------------------------ -------------------------Received on 2005-06-02Z17:14:02