Re: [ba-ohs-talk] new version of graph model paper posted
Lee Iverson wrote:
> I'm not sure I follow. What kinds of queries would lead to these
> "bifurcations"? In a general sense, since equality of two nodes is
> easy to determine, it is fairly simple to ensure that in any query
> result multiple references to the same node get properly resolved. (01)
I was thinking of graph structures like the following: (02)
A--------------B1
| |
| |
| |
B2--------------C (03)
Where B1 and B2 are not identical nodes, but nonetheless contain the
same value in respect of the particular
property being queried for.
So if I express my query as A-[B*]-C then some sort of decision has
to be made about what the result should be: Two B's or two C's or what?.
(One way would be to bin the idea of ordinary documents altogether and
just have hyperdocuments.) (04)
HTH,
Peter (05)
----- Original Message -----
From: "Lee Iverson" <leei@ece.ubc.ca>
To: <ba-ohs-talk@bootstrap.org>
Sent: Wednesday, April 17, 2002 5:44 PM
Subject: Re: [ba-ohs-talk] new version of graph model paper posted (06)
> On Tue, 2002-04-16 at 15:48, Peter Jones wrote:
> > Lee Iverson wrote:
> > >What is the query language though?
> >
> > Won't NODAL have to have two separate layers of expression for a
> > query language as the node content and metadata nodes are separate?
> > Or am I being dim?
>
> Layers of expression? I'd phrase the issue as one of selecting nodes
> based on a wide variety of parameters, including edit history,
security,
> and content. I don't see any particular reason that these things
should
> be expressed or treated so differently. In a certain respect, a
node's
> metadata can be treated as simply a set of properties that are common
to
> all nodes.
>
> > And, thinking aloud, if the NODAL nodes (= the metadata nodeset)
> > are a graph (not a tree) then isn't there a possible issue with
> > decidability in node
> > retrieval if a bifurcation (or n-furcation) has multiple endpoints
of
> > the
> > same value wrt the query parameters?
> > Or has some genius out there already covered that one?
>
> I'm not sure I follow. What kinds of queries would lead to these
> "bifurcations"? In a general sense, since equality of two nodes is
> easy to determine, it is fairly simple to ensure that in any query
> result multiple references to the same node get properly resolved.
>
> --
> ----------------------------------------------------------------------
---------
> Lee Iverson
> leei@ece.ubc.ca Dept of ECE, 2356 Main Mall
> http://www.ai.sri.com/~leei/ Vancouver BC Canada V6T 1Z4
> Office: (604) 822-3381
>
> (07)