- From: Pat Hayes <phayes@ai.uwf.edu>
- Date: Tue, 13 Nov 2001 19:38:45 -0600
- To: Patrick.Stickler@nokia.com
- Cc: w3c-rdfcore-wg@w3.org, "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>
>........ >> >This, of course, presumes that we are not asserting the >> >global constraint on data types that the lexical space of >> >any data type must be a proper subset of the lexical space >> >of all of its superordinate types. >> >> Ah, but we must make that assumption; I have already conceded >> that point. > >But XML Schema simple data types fail that requirement. Thus, >we cannot make that assumption. Only value spaces for XML >Schema simple types are proper subsets of the value spaces >of their superordinate types. Lexical space is specific to >each type. I had hoped that was not the case, but it is. Can you please elaborate on this point, with an example, as it seems rather important. I was under the impression that XML Schema datatypes DID satisfy the required conditions. To fail, we need the following circumstances: two datatypes D1 and D2 with the value space of D1 being a subset of that of D2, and the lexical space of D1 intersecting that of D2, and D1 having a different, and incompatible, lexical-to-value mapping on that intersection from that used by D2. Pat -- --------------------------------------------------------------------- IHMC (850)434 8903 home 40 South Alcaniz St. (850)202 4416 office Pensacola, FL 32501 (850)202 4440 fax phayes@ai.uwf.edu http://www.coginst.uwf.edu/~phayes
Received on Tuesday, 13 November 2001 20:38:42 UTC