Re: Date's First Great Blunder
Date: Wed, 14 Apr 2004 15:59:02 -0500
"Eric Kaun" <ekaun_at_yahoo.com> wrote in message
> "Dawn M. Wolthuis" <dwolt_at_tincat-group.com> wrote in message
> > There is not
> > one correct mathematical model for data, metadata, nor functions (by
> > whatever names).
> "Correct"? Is that even possible?
Nope, unless you think it is possible to have a correct metaphor.
> > > Many people confuse a class with its definition.
> > Me, for exampe. The term is used both ways. I prefer to think of a
> > as a specification for (that is, metadata regarding) a domain/type.
> > can "see" of the class is a specification "in writing" (e.g.
> > and a compiled version of that spec (e.g. MyType.class). The set of
> > that could be instantiated by way of this specification of the type is
> > abstract. So, I prefer using the term "class" as a definition/spec of a
> > type and the term "type" as the more abstract (invisible) set. I think
> > helps avoid some of the confusion in terms, perhaps, maybe, a little
> So a class is simply an implementation of a type? That seems to be what
> you're getting at.
"Type" is not my favorite word, but if, indeed, it is the very same word as "domain" then it seems to me that a class is the specification of a domain. The class itself is not the domain "set" but, rather, an object of software that specifies the domain. I suppose that one could equate a specification with a set and surely there is a mapping (a function) from the spec to the domain.
> > > No, code does not have any relationship with metadata.
> > really? What about the declarative code that specifies constraints on
> > data -- is that metadata? If the same information is in a procedural
> > language, does it cease to be metadata at that point?
> Yes, I'd say so. The line between "procedural" and "declarative" may be
> somewhat hard to define (at least I haven't seen a formal definition),
> though most of us would know either to see it.
What gives "declarative" a description of metadata that OO or functional or procedural or whatever other languages would not be able to claim? --dawn Received on Wed Apr 14 2004 - 22:59:02 CEST