From: Brian McBride <bwm@hplb.hpl.hp.com>

Date: Mon, 23 Jul 2001 19:41:44 +0100

Message-ID: <3B5C6FE8.72305ED2@hplb.hpl.hp.com>

To: jos.deroo.jd@belgium.agfa.com

CC: w3c-rdfcore-wg@w3.org

Date: Mon, 23 Jul 2001 19:41:44 +0100

Message-ID: <3B5C6FE8.72305ED2@hplb.hpl.hp.com>

To: jos.deroo.jd@belgium.agfa.com

CC: w3c-rdfcore-wg@w3.org

jos.deroo.jd@belgium.agfa.com wrote: > > Nice work, really! > > [...] > > > Let U be the set of URI References (as defined by RDF 2396). > ^^^RFC Yup - its like my car knowing the way to work - when I hit that capital R the D and F surely follow :) > > > > //ignore lang and namespaces for now > > Let S be the set of of UNICODE strings (UNICODE*) > > I guess U and S are denumerable, no? Yes > > > An interpretation I consists of: > > > > A set R of thingies > > > > A subset P of thingies which corresponds to Properties > > > > A mapping IN : U -> R > > > > A mapping IEXT : P -> R x R // R cross R > > Isn't the notation f: A -> B used for a function with > domain A and range B? Yes > But IEXT is not a funtion at all, it is a relation on > a cross product R x R which is simply a subset of R x R > IEXT(I(p)) = {<I(s),I(o)> el R x R: I(s) I(p) I(o) is true} Yes there's something screwy about what I wrote. I think I meant to write: IEXT : P -> powerset(R x R) i.e. IEXT is a mapping from from P to relations on R - the idea being to ensure that R x R is not a subset of R. Is that the same as you are suggesting? BrianReceived on Monday, 23 July 2001 14:44:21 EDT

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