Re: [Objectbridge-developers] OJB Homepage, OQL

[David F. <dw...@la...>]

Have you looked at the ODMG implementation from 
Ozone?  http://www.ozone-db.org ?

Also the VBSF software from Objectmatter (http://www.objectmatter.com) 
illlustrates a way to build up
a query (like an OQL query) by a set of calls.  There are other examples of 
this approach, too.  We
like this building up of a query, because it provides a nice programmatic 
interface to the query and increases efficiency.  It also may reduce the 
need initially to implement the full OQL parser, since it exposes 
programmatically the lower level  implementation in a consistent way.

Dave
At 04:29 PM 1/20/2001 +0100, Thomas Mahler wrote:
>Hi all,
>
>In the last days I was working on restructuring the documentation in a
>way that it can be used offline as well as online.
>First visible result: we have a REAL homepage:
>http://objectbridge.sourceforge.net.
>I hope you like the logo!
>I moved the doc directory into src/doc because it needs to be touched by
>the build script (for timestamps etc.) so it's cleaner to have it under
>src.
>
>After setting up a structure for documentation we have now no more
>excuse for not filling the structure with content. So everyone is
>invited to contribute some documents...
>
>During the last week I was having a look at free OQL implementations.
>The Only one I found was from CASTOR (http://castor.exolab.org). I see
>one major problem in reusing their OQL implementaion for OJB: it's so
>tightly integrated into the rest of their system, that it is virtually
>impossible to extract just one or two packages from their source tree...
>
>I found an OQL grammar description for the ANTLR parser generator on the
>ODMG site (http://www.odmg.org, have a look for the file OQL.G in the
>download area). This will help us building an OQL parser. But of course
>all processing of the parse tree has still to be done...
>I'm trying to get a idea what's the best way to go. Any ideas or
>suggestions?
>
>best regards,
>
>Thomas
>
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David W. Forslund                               dw...@la...
Computer and Computational Sciences             http://www.acl.lanl.gov/~dwf
Los Alamos National Laboratory          Los Alamos, NM 87545
505-665-1907                                    FAX: 505-665-4939