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.
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