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What's New in RDF 1.1?
 

What's New in RDF 1.1?

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The RDF Working Group at W3C has been busy with an update to the RDF standards, and this work is now nearing its end. Here I summarise what's new, what's been controversial, and also give a very brief ...

The RDF Working Group at W3C has been busy with an update to the RDF standards, and this work is now nearing its end. Here I summarise what's new, what's been controversial, and also give a very brief intro to the RDF data model.

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  • Wasn't aware that JSON-LD made it .. there has been lot's of controversy discussion. Good anyway, it's 'web scale' (and familiar for many). Will have to look it up what is missing in expressiveness.
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    What's New in RDF 1.1? What's New in RDF 1.1? Presentation Transcript

    • Richard Cyganiak — DERI Friday Talk, 26 July 2013 WHAT'S NEW IN RDF 1.1?
    • World Wide Web Consortium (W3C) • Standards body responsible for the Web • DERI is a member • What W3C can do for you: Member submissions – Community Groups – Work with experts, network, see how the sausage is made
    • Today • RDF — A quick overview • What's new in RDF 1.1? – JSON-LD • The controversies and stuff that didn't make it
    • RDF — A quick intro
    • Why RDF? • • • • A data model for the Web Can represent data from other data models Easy to integrate data from multiple sources Graphs, not tables or trees
    • How it works
    • How it works
    • How it works
    • How it works
    • How it works
    • Foundation for a family of standards • • • • • • • • SPARQL: Querying RDF data RDF Schema: Documenting the meaning of RDF data OWL: Formalizing the meaning of RDF data RDF/XML: Writing RDF data in XML RDFa: Embed RDF data in HTML R2RML: Mapping relational data to RDF GRDDL: Mapping XML data to RDF DC, Org, FOAF, SIOC, DCAT, VoID, …: Describe particular domains as RDF data
    • What's new in RDF 1.1?
    • RDF 1.1 • First update since 2004 • RDF-WG started in 2011, expected to end 2013 • Chartered to do: – Maintenance – Fixing some well-known issues – "Paving the cowpaths" • Nothing new in RDF Schema and RDF/XML
    • RDF datasets A.k.a Named Graphs, Quads
    • http://svn.foaf-project.org/foaftown/2009/layers/visuals/layercake2.jpg
    • RDF Datasets • Adopted from SPARQL — "Named Graphs" • Two data structures: – RDF graph – RDF dataset • Multiple RDF graphs, each named with a URI • A.k.a “quads” • Unnamed “default graph” – can be used for metadata • Applications: integration, provenance, versioning, …
    • Datatypes • xsd:duration, xsd:dayTimeDuration, xsd:yearMonthDuration • xsd:dateTimeStamp – Unlike xsd:dateTime, the time zone is not optional • rdf:langString – "Hello"@en now has a datatype • rdf:HTML – "E=mc<sup>2</sup>"^^rdf:HTML – Problem: No language tag! • rdf:XMLLiteral – No longer needs to be canonical XML • xsd:string – "xxx" and "xxx"^^xsd:string are now 100% the same thing
    • Syntaxes • Turtle – Now SPARQL compatible • TriG – Turtle with named graphs • N-Triples – WG Note • N-Quads – WG Note • JSON-LD
    • JSON-LD
    • { "id": "markus", "firstname": "Markus", "lastname": "Lanthaler", "homepage": "http://www.markus-lanthaler.com/" }
    • { "@context": { "firstname": "http://schema.org/givenName", "lastname": "http://schema.org/familyName", "homepage": "http://schema.org/url" }, "id": "markus", "firstname": "Markus", "lastname": "Lanthaler", "homepage": "http://www.markus-lanthaler.com/" }
    • { "@context": { "firstname": "http://schema.org/givenName", "lastname": "http://schema.org/familyName", "homepage": "http://schema.org/url" }, "@id": "/people/markus", "firstname": "Markus", "lastname": "Lanthaler", "homepage": "http://www.markus-lanthaler.com/" }
    • { "@context": { "firstname": "http://schema.org/givenName", "lastname": "http://schema.org/familyName", "homepage": "http://schema.org/url" }, "@id": "/people/markus", "firstname": "Markus", "lastname": "Lanthaler", "homepage": "http://www.markus-lanthaler.com/" }
    • { "@context": { "firstname": "http://schema.org/givenName", "lastname": "http://schema.org/familyName", "homepage": "http://schema.org/url" }, "@id": "/people/markus", "firstname": "Markus", "lastname": "Lanthaler", "homepage": { "@id": "http://www.markus-lanthaler.com/" } }
    • { "@context": { "firstname": "http://schema.org/givenName", "lastname": "http://schema.org/familyName", "homepage": {"@id": "http://schema.org/url", "@type": "@id" }, }, "@id": "/people/markus", "firstname": "Markus", "lastname": "Lanthaler", "homepage": "http://www.markus-lanthaler.com/" }
    • { "@context": { "firstname": "http://schema.org/givenName", "lastname": "http://schema.org/familyName", "homepage": {"@id": "http://schema.org/url", "@type": "@id" } }, "@id": "/people/markus", "@type": "http://schema.org/Person", "firstname": "Markus", "lastname": "Lanthaler", "homepage": "http://www.markus-lanthaler.com/" } Example from Markus Lanthaler, http://www.slideshare.net/lanthaler/building-next-generation-web-ap-is-with-jsonld-and-hydra
    • The controversies and stuff that didn't make it
    • Deprecating some of the bad stuff • • • • • Reification rdf:Alt, rdf:Bag, rdf:Seq RDF/XML  rdf:value For every bad feature, there is a vocal user who can't live without it
    • Literals as subjects • 1 math:lessThan 2 • "2013"^^xsd:gYear time:isBefore "2014"^^xsd:gYear • "Galway" ex:isTitleOf<http://dbpedia.org/resource/Galway> • Most specs and implementations could be easily adapted to allow this • Not worth it
    • Semantics of RDF datasets • What logical statements does an RDF dataset make? – How can we reason over them? • In a named graph, what is the relationship between the graph name URI and the RDF graph? – Same as? Is described by? Contains? • No solution fits all use cases. It's left unspecified. – No standard way to reason over RDF datasets
    • Nested and anonymous graphs • What about: "Bob said that Alice said XXX"? • Should we allow graphs as a new type of node in RDF triples? – URIs, literals, blank nodes, RDF graphs • Little implementation experience (but N3!) • Requires new DBs, different query language