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   RE: Property role and domain (was: Playing with XML Schema & XSLT)

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  • From: "Bullard, Claude L (Len)" <clbullar@ingr.com>
  • To: KenNorth <KenNorth@email.msn.com>, xml-dev@xml.org
  • Date: Mon, 10 Jul 2000 13:48:56 -0500

There is also a DTD from that timeframe (the Semantic DTD) 
that included a role attribute plus an attribute for 
naming the element type from which an element type in 
a different DTD was mapped. 

Even if we see XML schemas and use the transform tools, 
this isn't much of an advantage over the use of the 
relational systems for which we provide import and 
export.  The same problem of semantic mapping exists 
and the same resource consuming task of getting all 
of the communicating partners to agree on meanings 
exists.  Specifying and creating interfaces remains 
an expensive business.

The wall to wall enterprise vendors have a significant 
advantage and that argues for application service providers 
but against a semantic web.

Len Bullard
Intergraph Public Safety

Ekam sat.h, Vipraah bahudhaa vadanti.
Daamyata. Datta. Dayadhvam.h

-----Original Message-----
From: KenNorth [mailto:KenNorth@email.msn.com]

> This argues for something like the "role"
> attribute, although you could do it some other way, like a "role" child
> element.

Interesting. Terry Halpin's semantic modeling technique (Object Role
Modeling) is based on objects playing roles:

"In ORM, objects play roles within a domain and participate in facts. An
object's arity expresses the number of roles it plays, so a unary fact is an
object playing a single role. A binary fact plays two roles, ..."

That was from a September 1994 article, when tools had transformations for
database schemas. By next year, we'll probably see XML schemas.

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