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META TOPICPARENT |
name="InterOpMay2005" |
Participants
F. Ochsenbein (FO), G. Lemson (GL), M. Taylor (MT), A. Preite-Matrinez,
S. Derriere, R. Hook, J. Lindroos, A. Kembhavi, J.M. Desert (JMD), T. Takata,
S. Honda, M. Tanaka, D. Sforna, A. Alan (AA), R. Gutierrez Sanchez,
N. Moreau, J. Gupchup (JG), N. Urunkar (NU), B. Hajime, J.C. Mc Dowell (JCM),
B. Debray, A. Rots (AR)
Timetable
Time |
Work Pkg |
Content |
Leader |
14:00-15:00 |
|
VOTable applications and Questions |
|
14:00 |
|
About C++ Parser and CONVOT (ppt) |
Nilesh Urunkar |
14:20 |
|
About STIL/STILTS/TOPCAT (ppt) |
Mark Taylor |
14:40 |
|
Improvement of the VOTable schema (ppt) |
Gerard Lemson |
15:00-15:30 |
|
UCDs and utypes |
|
15:00 |
|
UCD1+ (pdf) |
Sebastien Derriere |
|
|
utype connection (sxi) |
Jonathan McDowell |
16:00-17:00 |
|
COOSYS vs stc:AstroCooSystem |
|
16:00 |
|
STC (ppt) |
Arnold Rots |
16:15 |
|
Discussion |
|
17:00 |
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Other Questions (other datatypes,serializations,...) |
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Materials and notes from the work group and plenary sessions
VOTable session meeting notes (monday PM)
Introduction (FO)
Starlink VOTable software (MT) (slides in ppt)
STIL: generic table processing library.
- Full implementation of VOTable standard
- Non catastrophic schema changes easily supported
- Table-aware DOM, table-aware SAX
TOPCAT: graphical interface do read/write/update tables
STILTS (STIL Tool Set)
- votcopy : converts DATA encoding
- volint: parsing VOTable and warning for troubles
Discussion
- MT remarks that future developments is uncertain (funding issues)
- Usage : JCM is using it and happy with it -- FO too.
- AA asks precisions on the usage of volint: more intended for VOTable producer than for end user
- C++ non-streaming parser (supports binary+FITS), using xerces+xalan
- VOTable streaming parser: v2.0 release 2005, april 8 (support VOTable v1.0 and 1.1, and Binary + FITS data)
- VOPlot : visualization toolkit (VO-India) 2D, 3D. Forthcoming release: support multiple table/resources. Integration with tools VOStat, GalICS
Discussion
- MT: How many points in plot?
- No technical limit, depends on memory. Tests are being done, but >1million points with regular desktop machine should work.
- JMD: Ability to plot VOTables with errors?
- Not likely if VOTable is really bad formed. VOPLot relies on SAVOT parser, so it will have same flexibility (true also in case of schema changes: use new version of SAVOT).
- GL: VOPlot as applet: bit hard to use.
- NU: Release of documentation soon.
Suggested changes in schema (GL) (slides in ppt)
No element ref construct
No global elements for attributes and contained classes
Analogy to java binding / inheritance
Discussion
- Not a lot of discussion on mailing list so far
- PARAM inherited from FIELD would be an improvement: agreed
- GL: We could deal with documents only containing TABLE, with no VOTABLE element
- No opposition in the room: suggestion to change schema to version 1.11 with GL's suggestions
ucd and utype attributes (slides in pdf)
Reminder differences between ucd and utype attributes.
Issues: how to distinguish if the contents of the ucd attribute is
a UCD1 or a UCD1+? Different possibilities:
- impose that from VOTable version 1.2 only UCD1+ is used
- ucd="UCD1+", and add new attribute for keeping track of UCD1
- ucd="UCD1", and add new attribute for giving of UCD1+
Discussion
Change in schema to accomodate full compliance with
UCD1+ syntax (allow ':' char).
Favored solution is to impose the usage of UCD1+ starting with
VOTable version 1.2. Better to change number from 1.1 to 1.2
(rather than 1.11) to indicate significant change. We keep the ucd
attribute alone, and its content must be a UCD1+
- Currently, utype has type "String".
- Use XPATH-like syntax: sed:Segment/Frame/Time/Type
- Write short formal document defining the syntax.
Discussion
MT: Be careful that an exact XPath requirement is maybe not what
we want (implies more than we want here).
JCM: ask again about XPath during DM discussion
Coffee Break
- Need to know: reference frame, time frame, reference position
- Coordinates
- Coordinate Area
- Implementations: STC-X (schemata) and STC-S (string version)
- or link to a template with xi:include (simplify the physical XML documents)
- STC System is extensible
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