- From: Henry Story <henry.story@bblfish.net>
- Date: Sun, 26 Feb 2012 10:43:24 +0100
- To: public-rdf-comments@w3.org
In section 5.3 of the latest Turtle editors draft [1] I read [[ Beginning the collection production records the curSubject and curPredicate, sets curSubject to a novel blank node Bhead and sets curSubject and curPredicate to Bhead and rdf:first respectively. Each object O in collection allocates a novel blank node Bn, creates an additional triple curSubject rdf:rest Bn . and sets curSubject to Bn. Finishing the collection production creates an additional triple curSubject rdf:rest rdf:nil . and restores curSubject and curPredicate The node produced by matchingcollection is the blank node Bhead. ]] Is this correct? In most programming languages one thinks of Nil as itself a list (just the empty one). So one thinks that :tasks todo () . as equivalent to :tasks todo rdf:nil . Things are a bit odd, as otherwise it is not clear what the rdf:first of () is . This seems wrong: :tasks todo _:t1 . :t1 rdf:first ? . :t2 rdf:next rdf:nil . I see that this is tricky to describe correctly. Lists are usually described recursively. Henry [1] http://dvcs.w3.org/hg/rdf/raw-file/default/rdf-turtle/index.html#sec-parsing-triples Social Web Architect http://bblfish.net/
Received on Sunday, 26 February 2012 09:43:55 UTC