Latest ADQL doc and next interop meeting

[Pedro Osuna]

Dear all,


please find attached the latest ADLQ doc version (with main changes  
highlighted) that has been compiled with the VOQL-TEG.

The next interop meeting is approaching, and we have at our disposal  
one single session (90 min) which should be enough now that we have  
handed down the TAP to the DAL, as initially planned.


This session will deal mainly with the main pending issue to finalise  
the ADQL doc, namely that of the REGION. I expect to have two or  
three guys from the VOQL-TEG to present their work towards  
convergence of the REGION construct, which looks very promising.

The end of our session will hold a UTYPE/UFI(?) discussion, although  
I suspect we might not have time enough for it. This will be shared  
with the DM group.

Should any of you want to tackle any other issue within the session,  
please let me know.

Cheers,
P.

________________________________________________________________________ 
__________
(From Inaki Ortiz, archived voql-teg mail http://ivoa.net/forum/voql- 
teg/0709/0221.htm)

  ADQL draft specification (1.5-20070903).

This version includes the following changes in the BNF grammar:
+ SQUARE included in the list of ADQL reserved words.
+ DEC removed from the list of SQL reserved words. (To avoid possible  
conflicts with declination references)
+ SQL embedded language characters (left and right bracket) included.
+ Ampersand, question mark, semicolon and vertical bar added to the  
list of SQL special characters.
+ Boolean test simplified. UNKNOWN taken out. Boolean test replaced  
by boolean factor.
+ First sketch of user defined function construct. Presence of a  
default function prefix placeholder.
Added to character primary and numeric value function. Function-like  
construct with unlimited number of
numeric value expressions separated with commas. Optional  
qualification through default function prefix.
+ Catalog name added to qualify database schema names. Unqualified  
schema name added (points to standard identifier).
+ Comparison operator renamed to comp_op (as in SQL92).
+ Delimited identifier and ADQL special character added to delimited  
token construct.
+ Delimited identifier correction to allow double quotes and/or  
whitespaces.
+ Alias support for joined tables and usage of derived table and  
subquery definitions.
+ General literal construct added to hold different literal data  
types (string for the time being only, it eases future extensions).
+ Like predicate generalized using match value and pattern constructs.
+ Not equals operators split into two.
+ Null predicate corrected. Column reference added at the beginning  
of the construct.
+ Region specification and predicate constructs left empty. To hold  
whatever we agree shortly.

_________________________________________
Pedro Osuna Alcalaya

European Space Agency (ESA)
European Space Astronomy Centre (ESAC)
Science Operations Department (SCI-O)
Science Archives and Computer Support Engineering Unit (SCI-OE)
e-mail: Pedro.Osuna at esa.int
Tel + 34 91 813 13 14    Fax: +34 91 813 11 72
_________________________________________
European Space Astronomy Centre (ESAC)
P.O. Box 50727
E-28080 Villafranca del Castillo
MADRID - SPAIN





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