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Strawpoll proposals on terminology

From: Ian Davis <ian.davis@talis.com>
Date: Wed, 12 Oct 2011 22:22:20 +0100
Message-ID: <CAAiX05HHL8c+NpHNDKT6GU-dxz7Yhz=o+LZ-X=mgpZD9qcLHFw@mail.gmail.com>
To: RDF WG <public-rdf-wg@w3.org>
I think we would get understand the extent of consensus in the group if we
ran some strawpolls on usage of our terminology with some concrete
statements

I restated some definitions from SPARQL 1.1 using explicit RDF Graph and RDF
Container terminology. I also extended the idea of explaining in prose what
certain SPARQL queries mean. I finally threw in a few statements that push
the boundaries of what we discussed today.

S0) The state of a Graph Container is an RDF Graph.

S1) A Graph Store contains one (unnamed) slot holding a default Graph
Container and zero or more named slots holding named Graph Containers.

S1a) A Graph Store contains one (unnamed) default Graph Container and zero
or more Graph Containers each associated with a IRI.

S2) An RDF Dataset is a set { G, (<u1>, G1), (<u2>, G2),... (<un>, Gn) }
where G and each Gi are RDF Graphs and each <ui> is an IRI.

S3) The RDF Graphs in an RDF Dataset are the states of the Graph Containers
contained in the Graph Store.

The following all assume <g> is associated with a Graph Container in the
Graph Store

S4) When we write SELECT * WHERE { GRAPH <g> {?s ?p ?o} } we mean the SPARQL
engine should retrieve the RDF Graph that is the state of the Graph
Container that <g> is associated with and evaluate the graph pattern against
the RDF Graph.

S5) When we write INSERT DATA { GRAPH <g> { :s :p :o } }  we mean the SPARQL
engine should retrieve the RDF Graph that is the state of the Graph
Container that <g> is associated with, perform an RDF-Merge operation
between that RDF Graph and :s :p :o and set the state of <g> to be the
resulting graph.

S6) When we write DELETE DATA { GRAPH <g> { :s :p :o } } we mean the SPARQL
engine set the state of the Graph Container that <g> is associated with to
the empty RDF Graph

S7) When we write SELECT * WHERE { GRAPH <g> {?s ?p ?o} } the triple <g>
rdf:type :GraphContainer is true for some <g>

S7a) When we write SELECT * WHERE { GRAPH <g> {?s ?p ?o} } the triple <g>
rdf:type :GraphContainer is true for all <g>

S8) When ASK WHERE { GRAPH <g> { :s :p :o } } evaluates to true and <g> is
an http IRI then at some time in the past an HTTP GET request to <g> has
returned a document that when parsed results in a graph that contains the
triple :s :p :o





-- 
Ian Davis, Chief Technology Officer, Talis Group Ltd.
http://www.talis.com/ | Registered in England and Wales as 5382297
Received on Wednesday, 12 October 2011 21:22:48 GMT

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