Re: Has anyone modeled extension or inheritance?

what is it you are asking exactly?

"Svenigalla" <vu2syy_at_yahoo.com> wrote in message news:3AC6857B.F469FAAA_at_yahoo.com...
> I am working on a relational model [ODBMS ideas? No, thank you! :-) ]
> for a Content Repository. I want to know if anyone has modeled something
> like the following before, and any pointers in the right direction are
> appreciated.
>
> A document (D) contains a set of Fields(F).
> D can have multiple versions, each version has a set of fields in F.
> Multiple versions can share fields.
>
> Document K can be created from D, by inheriting all fields D has.
> Afterwards, K can override any field from D. K can add its own fields.
> After extending, if D added/deleted/changed its fieldd, K sees the
> changes unless those fields are overridden by K.
>
> K can be extended to make P. P's inheritance goes all the way to D.
>
> A document can inherit from only one parent.
>
> When a new version is made for parent, all its children automatically
> see the new version content, if those fields are not over-ridden.
>
>
>
Received on Sat Apr 21 2001 - 04:18:29 CEST