RE: AW: AW: [Objectbridge-developers] generating mapping files and da taba ses

[<ll...@li...>]

Yeah. You are right there.
The formats are too unestablished to depend on.

It would be pretty easy to generate a XSLT program that can transform
between the two formats. Then the castor tools would be applicable to
ObJectBridge.

Once I get to know the format better, I might be able to produce such a
stylesheet. Then I could contribute the stylesheet to the castor tools
as an objectbridge extension.

/Lasse

-----Original Message-----
From: obj...@li...
[mailto:obj...@li...] On Behalf
Of Thomas Mahler
Sent: 1. januar 1997 00:30
To: Lasse Lindg=E5rd
Cc: obj...@li...
Subject: Re: AW: AW: [Objectbridge-developers] generating mapping files
and da taba ses


Hi Lasse,

Lasse Lindg=E5rd wrote:
>=20
> Have you looked at the http://castor.exolab.org format for mapping
files
> ??
>=20
> As far as I can read from their mailing list several project exists
that
> can generate castor mapping files. DDL programs also exists.
>=20
> I don't know castor JDO that well, but I looked at the mapping files
and
> they look pretty much the same contentwise as the objectbridge ones.
>=20
> Wouldn't that be better than reinventing the wheel ?

Sure the best thing would be to have a standardized DTD for O/R
mappings. There are also some attempts in this direction (see for
example Jon Garfunkels LORAX project
http://www.coopdata.net/software/lorax/). There is also XMI which tries
to be a unifed standard for UML models... There is also a DTD for
describing mappings in JDO...
But I none of these attempts has succeeded as a generally accepted
standard.

I also had a look at the Castor DTD. Of course it has things in it we
could reuse. But it's all so intermixed with stuff for XML mapping, LDAP
access, etc. that I won't like to have it as grammar for describing O/R
mapping.
Sure it would be great to have an O/R mappings interchangeable between
both tools!
=20

So long as there is no standard I guess the best thing we can do is to
have a very simple DTD that fits all OJB mapping needs and nothing more.
This will keep parsing simple. Once there is an established standard we
can easily adopt to it.

--Thomas


>=20
> /Lasse
>=20
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> Objectbridge-developers mailing list
> Obj...@li...
> http://lists.sourceforge.net/lists/listinfo/objectbridge-developers


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