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

[Thomas M. <tho...@ho...>]

Hi Lasse,

Lasse Lindg=E5rd wrote:
> =

> Have you looked at the http://castor.exolab.org format for mapping file=
s
> ??
> =

> As far as I can read from their mailing list several project exists tha=
t
> can generate castor mapping files. DDL programs also exists.
> =

> I don't know castor JDO that well, but I looked at the mapping files an=
d
> they look pretty much the same contentwise as the objectbridge ones.
> =

> 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!
 =


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


> =

> /Lasse
> =

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