RE: [search-ws] generalizing cql-form to parameterized queries

["LeVan,Ralph" <levan@oclc.org>]

Why do we need this?

SRU defines the optional parameter queryType.  SRU has a distinguished
queryType, CQL.  When queryType is absent, its default value is CQL.
SRU no longer defines the query parameter.

Every queryType defines the parameters it needs.  CQL defines the query
parameter.  Cql-form defines an open-ended raft of parameters.

I see no value in the concepts of parameterized and string queries.

Ralph

-----Original Message-----
From: Denenberg, Ray [mailto:rden@loc.gov] 
Sent: Tuesday, December 28, 2010 2:57 PM
To: 'OASIS SWS TC'
Subject: [search-ws] generalizing cql-form to parameterized queries

These are the changes to SRU, as I see it, to accommodate cql-form.
Please comment, as I want to write this into the draft I am working on. 


The specific name CQL-form need not be mentioned in SRU (except perhaps
by example), however we do need to generalize it, for other similar
query types that come in parameterized form and we need a name for this
generalization so that we can talk about it in SRU. 

Can we call it "parameterized query"?

So there will be a class of queries distinguished as Parameterized
Queries. CQL-forms will be in this class. Thus, two classes of queries
'string' and 'parameterized'.   (Hopefully we won't later discover that
we need yet a third class.)

I think every query (other than well-known) will need a URI and in
explain you assign it a short name that is to be used in the queryType
parameter when accessing that server. That would mean, for example then,
that CQL-Forms is just a local name anyway (unless we decide it is
well-known).  And you indicate in the explain file whether the query is
of class 'string' or 'parameterized'.

Thus for any request

- If there is a query parameter:
The query is of class 'string', and the value of the query parameter is
the query string. The parameter queryType will be included if the query
is of type other than cql and may be omitted or included for a cql query
but in any case it will be of class 'string'.
 
- If there is no query parameter:
 The query is of class 'parameterized'. The queryType parameter MUST
occur and there MUST be one or more parameters in the request as
specified by the specification for that query.

Anything else?


--Ray



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