Ray Denenberg, Library of Congress wrote:
> Sorry for my loss of memory here. In Mike's (excellent) CQL tutorial
> http://zing.z3950.org/cql/intro.html there is the example:
> dc.title=dinosaur and dc.author=farlow
> showing how to associate a url with an index prefix.
> And I actually do (vaguely) recall that we agreed to this, after a
> very long discussion and one of the hottest debates we've had (so
> long and hot that I can't validate agreement from the archive).
> But if we did agree, it's not in the bnf.
> Did we agree and if so why was it never added to the bnf?
IIRC Ray suggested for indexes in the beginning of a query. Others such
including myself wouldn't mind having indexes everywhere. This is the
use (and is very close to the one I suggested on the ZNG list, 13 Nov 2002):
search-clause ::= "(" cql-query ")" | [index-name relation] term
| ">" [identifier "="] term cql-query
Examples of equivalent CQLs:
> p a == >p (a) == (>p a)
> p a and b == > p (a and b)
> p1 > p2 a and b == >p1 ( >p2 (a and b))
> p1 a and >p2 b == >p1 (a and >p2 b)