IVOA VOQL session - Part 1
Oct 7 2005

(1) ADQL and Skynode news
-- ADQL <--> Skynode translation from ESA-VO
-- Java Skynode implementation from NVO
-- Large crossmatch work started

(2) ADQL specification
-- Xmatch specification, how many parameters?
	** specifying spherical distance in ADQL

(3) Shirasaki presentation
ADQL grammer has been specified: identifiers, datatypes, functions
Core syntax + extensions
Core provides easy transition from DAL to skynode
Core provides guaranteed interoperability, extensions provide extra functionality
Core is basic SELECT, no join, expression, orderby, distinct, etc etc
Extensions: top, offset
	** but the TOP keyword is the right way to visualize results perhaps put in Core?
	** can we have TOP without ORDERBY?
	** conclusion: Top returns n rows, but order is arbitrary
UCD and utype in selection list (select ucd 'pos.eq.ra')
	** can we also have UCD in the where clause?
	** it is a convenient thing, but full of ambiguity, little enthusiasm for this
Identifier syntax
	** what characters are allowed in table names, column names, function names
	** brackets [ ] to deal with special characters
Data types follow VOTable
	** timestamp, time, date, timeinterval
	** conclusion: only keep VOTable data types for returned data tables
Timestamp literal expression
	** difference between SQL and ISO8601 specification
Space data type from STC-S
Specifying table names qualified by archive names, what can we use for a short name?
	** can we use the SHORTNAME that the registry has? Can we demand uniqueness? (no)
	** conclusion: we use the identifier


Skynode 0.7 to 1.0
Enforcing metadata quality

Brian Thomas presentation -- VO Catalog
Andre Schaaf presentation -- Vizier in contect of ADQL/Skynode