NEW ADQL draft + BNF grammar

[Iñaki Ortiz de Landaluce]

Dear all

Please find attached an updated version of the 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.

Please do not hesitate to send any comment, question and/or suggestion 
to the VOQL-TEG mailing list.

Regards
Iñaki

-- 
Iñaki Ortiz de Landaluce

European Space Agency (ESA)
European Space Astronomy Centre (ESAC)
Science Operations Department (SCI-O)
Science Archives Engineering Unit (SCI-OE)

E-mail: Inaki.Ortiz at sciops.esa.int
Tel: +34 91 813 13 67  Fax: +34 91 813 13 22

European Space Astronomy Centre (ESAC)
28691 Villanueva de la Cañada
P.O. Box 78, Madrid, SPAIN 


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