SPARQL 1.1 Status

1.1,[object Object],What’s coming and what might be coming?,[object Object],May, 2010,[object Object],Latest at http://www.slideshare.net/LeeFeigenbaum/sparql2-status,[object Object],Lee Feigenbaum, Co-chair, SPARQL Working Group,[object Object],lee@thefigtrees.net,[object Object]

Disclaimer,[object Object],The SPARQL Working Group has not yet decided many of the technical questions surveyed in these slides. All examples are subject to change; please do not construe them as indicators or endorsements of specific technical designs/decisions.,[object Object],All opinions are Lee Feigenbaum’s alone.,[object Object]

Naming,[object Object],SPARQL 1.1 is the collective name of the work produced by the current SPARQL Working Group. The actual components being worked on are known as:SPARQL 1.1 QuerySPARQL 1.1 Update,[object Object],SPARQL 1.1 Service Description,[object Object],…,[object Object]

Where are we now?,[object Object],Today,[object Object],August 2010,[object Object],March 2009,[object Object],???,[object Object],Last Call and beyond of core SPARQL specifications,[object Object],July 2009,[object Object],FPWD of SPARQL New Features and Rationales document,[object Object],October 2009,[object Object],FPWD of core SPARQL specifications,[object Object]

Projected Expressions,[object Object],Select expressions other than variables (literals, functions on literals and variables, etc.),[object Object],SELECT (?price* ?qty AS ?total_price),[object Object],WHERE {,[object Object], …,[object Object],},[object Object]

Aggregates,[object Object],À la SQL aggregates (MIN, MAX, COUNT, AVG, SUM etc.),[object Object],Issues around:,[object Object],Aggregates and error values,[object Object],Grouping by expressions,[object Object],SELECT (MIN(?price) AS ?min_price)…,[object Object],WHERE { … },[object Object],GROUP BY ?item,[object Object]

Subqueries,[object Object],Nested queries allow multiple queries to be combined into one. ,[object Object],SELECT ?article ?authorWHERE { ?article ex:author ?author . { SELECT ?article WHERE { … ?article … } ORDER BY … LIMIT … }},[object Object]

Negation,[object Object],Supplant the mystifying OPTIONAL/!bound method of negation with a dedicated construct,[object Object],Issues around:,[object Object],Filter semantics vs. set-difference semantics,[object Object],Graph pattern operators vs. filter functions,[object Object],SELECT … WHERE { ?person a foaf:Person .,[object Object],MINUS{ ,[object Object], ?person foaf:mbox ?email,[object Object], },[object Object],},[object Object]

Service Description,[object Object],A standard discovery mechanism and vocabulary for describing the capabilities, extensions, data sets, and more for a SPARQL endpoint,[object Object],Discovery. How can a client find the RDF that describes a SPARQL endpoint at a particular URI?,[object Object],Description. What predicates, classes, values, etc. should a client expect to find (and be able to query) once it locates a service description?,[object Object]

Update Language,[object Object],Based on the SPARQL Update member submission,[object Object],Batch insert & delete,[object Object],Insert & delete based on triple patterns,[object Object],Graph management (creation, removal),[object Object],Issues around:,[object Object],Defining a formal model for update,[object Object],Graph stores vs. RDF data sets,[object Object],Return codes,[object Object]

Update Protocol,[object Object],The ability to issue SPARQL/Update language statements via a standard protocol (e.g. via HTTP POST),[object Object],Issues around:,[object Object], Security,[object Object], Response HTTP codes ,[object Object]

HTTP RDF update (RESTful),[object Object],Where appropriate, map HTTP requests to SPARQL/Update operations,[object Object],DELETE /foo/g1 …-> DELETE DATA FROM ex:g1 …,[object Object],Issues around:,[object Object],Which mappings to include?,[object Object],Are graphs information resources?,[object Object]

Property Paths,[object Object],Support arbitrary-length predicate paths in triple patterns – “regular expressions” on predicates?,[object Object],Query hierarchical structures such as RDF collections,[object Object],Issues around:,[object Object],Duplicates and cycles in paths,[object Object],Negated path segments,[object Object],SELECT … WHERE { ?person foaf:knows+ ?network .,[object Object],},[object Object]

Basic Federated Query,[object Object],Initial scaffolding for authoring federated SPARQL queries,[object Object],Add a keyword to explicitly target portions of a query to specific endpoints,[object Object],Issues around:,[object Object],SERVICE and variables?,[object Object],Is federated query its own document?,[object Object],SELECT … WHERE { … SERVICE ex:books {,[object Object], …,[object Object], },[object Object],},[object Object]

Entailment Regime Semantics,[object Object],SPARQL/Query 1.0 defines a mechanism to extend SPARQL semantics for additional entailment regimes,[object Object],Use this mechanism to define the semantics of SPARQL queries for:,[object Object],RDF Schema,[object Object],OWL fragments,[object Object],RIF rule sets,[object Object],…,[object Object]

Common Functions,[object Object],Extend the set of functions that SPARQL engines must support to include some of…,[object Object],Common string functions (e.g. substr),[object Object],Common date/time/datetime functions,[object Object],Logical functions (COALESCE, IF, …?),[object Object],Limited discussion to date about which functions to include,[object Object]

Get Involved,[object Object],Join. ,[object Object],Email team-sparql-chairs@w3.org,[object Object],Follow. ,[object Object],WG materials at http://www.w3.org/2009/sparql/wiki/,[object Object],Comment. ,[object Object],Public feedback at public-rdf-dawg-comments@w3.org,[object Object],Use. ,[object Object],Discuss SPARQL at public-sparql-dev@w3.org,[object Object]

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