cwm/n3 and naming blank nodes?

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Hello world,

Maybe there's already an easy way to do this, so let me just describe the problem
and see what the world says. I'm hacking about with my PIM in RDF.

Let's say I have a contact like this:

ab:jdoe a ab:Contact;
  ab:firstname "Jane";
  ab:surname "Doe";
  p:born "1970-01-01" .

- From such a record, I want to imply a yearly repeating appointment:

this log:forAll :p, :s, :o, :t, :u, :l, :k, :m.

{ :p a ab:Contact .
  :p p:born :o } log:implies { [ a db:Appointment ;
                                   db:begin-date :o ;
                                   db:repeat [
                                      rdf:type db:Repeat ;
                                      db:frequency "1";
                                      db:type "Yearly" ] ] } .

That's all well and good, but now suppose I have

ab:jdoe2 a ab:Contact;
  ab:firstname "John";
  ab:surname "Doe";
  p:born "1970-01-01" ;
  p:died "1999-12-31" .

For such a record, I want to imply a yearly repeating appointment with an end date:

{ :p a ab:Contact .
  :p p:born :o .
  :p p:died :s } log:implies { [ a db:Appointment ;
                                   db:begin-date :o ;
                                   db:repeat [
                                      rdf:type db:Repeat ;
                                      db:end :s ;
                                      db:frequency "1";
                                      db:type "Yearly" ] ] } .

But if I have both of these rules, then I get two appointments, one with an
end and one without.

If I could provide an identifier for the birthday event, I think I
could just add the db:end property if there was a p:died property, but
I can't think of any way to give names to these newly constructed
nodes.

Am I overlooking something? Is there some way to construct names automatically?
(For example, if ":p" in the expression is ab:jdoe, I'd be quite content
to imply a new "db:jdow-birthday" node that I could subsequently refer to.)

                                        Be seeing you,
                                          norm

- -- 
Norman.Walsh@Sun.COM    | We look back on our life as a thing of broken
XML Standards Architect | pieces, because our mistakes and failures are
Web Tech. and Standards | always the first to strike us, and outweigh
Sun Microsystems, Inc.  | in our imagination what we have accomplished
                        | and attained.--Goethe
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Received on Sunday, 1 December 2002 14:16:28 UTC