Semantics in RDF and SPARQL Some Considerations
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1 Semantics in RDF and SPARQL Some Considerations Dept. Computer Science, Universidad de Chile Center for Semantic Web Research Dagstuhl, June 2017 Semantics RDF and SPARQL 1 / 7
2 Semantics of RDF: Summary I. URI (today IRI) Distributed creation and management of resources and vocabulary. Semantics RDF and SPARQL 2 / 7
3 Semantics of RDF: Summary I. URI (today IRI) Distributed creation and management of resources and vocabulary. II. Graph Structure Distributed population and linking of distributed data Semantics RDF and SPARQL 2 / 7
4 Semantics of RDF: Summary I. URI (today IRI) Distributed creation and management of resources and vocabulary. II. Graph Structure Distributed population and linking of distributed data III. Complex dealing with incomplete information Plus inconsistencies with SPARQL Semantics RDF and SPARQL 2 / 7
5 Semantics of RDF: Summary I. URI (today IRI) Distributed creation and management of resources and vocabulary. II. Graph Structure Distributed population and linking of distributed data III. Complex dealing with incomplete information Plus inconsistencies with SPARQL IV. Complex Logic Even for RDFS Semantics RDF and SPARQL 2 / 7
6 The relational core of SPARQL SPARQL 1.1 SELECT, FILTER, AND, UNION, and EXCEPT Multiset Relational Algebra (MRA) π, σ,, and \ Multiset nr-datalog SQL SELECT, WHERE, NATURAL JOIN, UNION ALL, and EXCEPT Semantics RDF and SPARQL 3 / 7
7 The relational core of SPARQL Equivalences (hold even under multiset semantics) SPARQL Multiset nr-datalog SQL Rel. Algebra SELECT X π X (...) L L 1,.., L n SELECT X... P FILTER C σ C (p) L L p, C FROM p WHERE C P. Q p q L L p, L q p NAT JOIN q P UNION Q p q L L p p UNION ALL q L L q P EXCEPT Q p \ q L L p, L q p EXCEPT q Semantics RDF and SPARQL 4 / 7
8 Semantic extensions of the SPARQL core Semantics RDF and SPARQL 5 / 7
9 Semantic extensions of the SPARQL core I. Bags Bag semantics is the default Semantics RDF and SPARQL 5 / 7
10 Semantic extensions of the SPARQL core I. Bags Bag semantics is the default II. Incomplete information Blanks and generation of unbounds (e.g OPTIONAL) Semantics RDF and SPARQL 5 / 7
11 Semantic extensions of the SPARQL core I. Bags Bag semantics is the default II. Incomplete information Blanks and generation of unbounds (e.g OPTIONAL) III. Paths Property Paths Semantics RDF and SPARQL 5 / 7
12 Semantic extensions of the SPARQL core I. Bags Bag semantics is the default II. Incomplete information Blanks and generation of unbounds (e.g OPTIONAL) III. Paths Property Paths IV. Subqueries (sub) SELECT and its consequences Semantics RDF and SPARQL 5 / 7
13 Semantic extensions of the SPARQL core I. Bags Bag semantics is the default II. Incomplete information Blanks and generation of unbounds (e.g OPTIONAL) III. Paths Property Paths IV. Subqueries (sub) SELECT and its consequences V. Delegation features FROM NAMED, GRAPH, SERVICE Semantics RDF and SPARQL 5 / 7
14 (And More) Semantic extensions of the SPARQL core Semantics RDF and SPARQL 6 / 7
15 (And More) Semantic extensions of the SPARQL core Logical reasoning RDFS, OWL etc. Semantics RDF and SPARQL 6 / 7
16 (And More) Semantic extensions of the SPARQL core Logical reasoning RDFS, OWL etc. OWA versus CWA and its relatio with RDF and SPARQL Semantics RDF and SPARQL 6 / 7
17 (And More) Semantic extensions of the SPARQL core Logical reasoning RDFS, OWL etc. OWA versus CWA and its relatio with RDF and SPARQL Several protocols Update et al. Semantics RDF and SPARQL 6 / 7
18 (And More) Semantic extensions of the SPARQL core Logical reasoning RDFS, OWL etc. OWA versus CWA and its relatio with RDF and SPARQL Several protocols Update et al. Who knows what else... God protects us... Semantics RDF and SPARQL 6 / 7
19 Two morals and a suggestion Fact SPARQL is an extremely complex language Warning It is not evident that the semantics of each extension behaves well when interacting with the other parts. Semantics RDF and SPARQL 7 / 7
20 Two morals and a suggestion Fact SPARQL is an extremely complex language Warning It is not evident that the semantics of each extension behaves well when interacting with the other parts. Suggestion To study the themes of federation work with the core Semantics RDF and SPARQL 7 / 7
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