[TAP] draft 0.42
patrick.dowler at nrc-cnrc.gc.ca
Mon Apr 27 12:37:52 PDT 2009
On Monday 27 April 2009 07:04:51 Francois Ochsenbein wrote:
>Sorry for the length of this message -- I tried nevetheless
>to be as brief as > possible in the enclosed comments related
>to TAP Version 0.42. Some comments are just typos, but a
> couple imply VOTable adjustments:
> ==> the usage of the <INFO> tag (sec. 2.9): should we (I mean the
> VOTable group) give up with the addition of sub-elements
> like <DESCRIPTION> in <INFO>, which are included in VOTable1.2 ?
This is in reference to placing content directly inside the INFO element
rather than using a child DESCRIPTION? If VOTable requires the child element
then the examples should be changed to comply. This section was not meant to
suggest a VOTable change, just how to use existing features. So, it should
have a child DESCRIPTION rather than child content?
> ==> the 'format' as a new attribute of <FIELD> (and therefore
> of <PARAMETER>): I assume this word is replaced by 'encoding',
> with a similar meaning of what is proposed in Apx A.5 of
> VOTable1.2. Is that agreeable ?
I was thinking some more about format vs encoding... The encoding as used in
A.5 is a way to encode binary as text and does not specify the format (of the
actual value). For example, one would would normally describe a graphic file
with (not specifically VOTable here):
So, despite my own suggestion, I think format and encoding should remain
distinct (also consistent use of the terms in http: content-type aka format
The use/meaning of encoding in A.5 could remain unchanged, although it would
be nice to be able to put it once in the FIELD rather than in every TD. I
would go back to Mark's original suggestion of a format attribute (for FIELD
and PARAM), which TAP would use like this, for example:
<FIELD datatype="char" arraysize="*" format="STC-S" />
to describe a region column, or
<FIELD datatype="char" arraysize="*" format="ISO8601" />
to describe a timestamp column. One could in principle store a graphic file in
a BLOB or varbinary column and describe it as:
<FIELD datatype="unisgnedByte" arraysize="*"
encoding="base64" format="image/png" />
assuming the proposal in A.5 is also adopted and encoding is allowed in the
FIELD and not just the TD.
> Comments on [TAP] draft 0.42
Thanks for all the detailed fixes; I will include asap.
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