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ZNG  November 2003

ZNG November 2003

Subject:

Re: New proposed grammar for CQL (revised from Yacc grammar)

From:

Mike Taylor <[log in to unmask]>

Reply-To:

Z39.50 Next-Generation Initiative

Date:

Fri, 28 Nov 2003 11:46:45 GMT

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (73 lines)

> Date: Fri, 28 Nov 2003 09:47:35 +0000
> From: Robert Sanderson <[log in to unmask]>
>
> > modifier = '/' modifierName [ '=' modifierParam ]
>
> I still disagree that this is necessary, as then our current
> modifiers will look like:
>
> any/stem=true/phonetic=true/relevant=true...
>
> If the reason is to make the queries more readable, then I think
> we're failing as PROX is by far the least commonly used bit of CQL
> compared to modifiers in general.

As you'll have seen in Alan's grammar, the proposal is for the
``comparitorSymbol modifierParam'' part to be optional.  I think
that's cool.

> Please, in favour of resolving 1.1 blocking issues, can we leave
> this discussion till 1.2 ?

I'd much rather sort this out now, one way or another.  We really
don't want to be making a fundamental change to the CQL syntax in
version 1.2.

> > Reserved words are 'and', 'or', 'not', and 'prox' (case
> > sensitive).  When a reserved word is used in term, the term value
> > is the word.
>
> CQL is and should be case insenstive.

It's case-insensitive now, yes.  I have no strong feelings over
whether or not that's how it should be, but the Principle Of Least
Buggering About suggests we should let sleeping fruitbats lie.

> > The values of index, namedComparitor, and modifierName are
> > structured and must be of the form [prefix.]name where the prefix
> > defines the context of the name. If omitted, the default context
> > is used.
>
> For indexes only.  The default context for all others is cql.

Correct.

> > The default context for queries (unless redefined in the
> > scopedSearchClause construct using '>uri') is the reserved context
> > name 'cql'.
>
> The default context for indexes is server defined. For SRW/U, it's
> //explain/configInfo/default/@type=contextSet in ZeeRex

Also correct.

> >     weight=<integer>
> >         Associate a normalised weight with this term in the query
> >         (0..1000). (From the new Attribute Architecture.)
>
> Does anyone use this? If so, for what?

That's a profiling issue.  I'd argue that most of the things Alan's
tried to stuff into the CQL context set fall into this category, too:
we don't need to standardise them as part of what CQL is, so let's
not.

 _/|_    _______________________________________________________________
/o ) \/  Mike Taylor  <[log in to unmask]>  http://www.miketaylor.org.uk
)_v__/\  "South Yorkshire mass murderer - how can you sleep at
         night?" -- Manic Street Preachers.

--
Listen to my wife's new CD of kids' music, _Child's Play_, at
        http://www.pipedreaming.org.uk/childsplay/

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