Frank van Harmelen Semantics: where are we now, where should we go? Creative Commons CC BY 3.0: allowed to share & remix (also commercial) but must attribute.

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Presentation transcript:

Frank van Harmelen Semantics: where are we now, where should we go? Creative Commons CC BY 3.0: allowed to share & remix (also commercial) but must attribute

Medicin is organised by organ

CS is organised as a stack Semantics increases Dick’s career

CS is organised as a stack

(Web-based) Semantics in 6 slides & a movie

P1. Give all things a name

P2. Relations form a graph between things

P3. The names are addresses on the Web x T [ IsOfType ] different owners & locations

P1+P2+P3 = Giant Global Graph

P4. explicit & formal semantics assign types to things assign types to relations organise types in a hierarchy empose constraints on possible interpretations O W L

Examples of “semantics”  married-to  is male married-to relates males to females  is male married-to relates males to females married-to relates 1 male to 1 female  =  married-to relates 1 male to 1 female  =  lowerboundupperbound  married-to

Did semantics get anywhere? Did semantics get anywhere?

Did semantics get anywhere? already many billions of facts & rules Encyclopedia Geographic names (millions) names of artists & art works (10.000’s) scientific bibliographies hierarchical dictionaries (UK, FR, NL) hierarchical dictionaries (UK, FR, NL) life-science databases any CD ever recorded (almost) May ‘09 estimate > 4.2 billion triples million interlinks May ‘09 estimate > 4.2 billion triples million interlinks basic facts on every country on the planet common sense rules & facts ( ’s)

It gets bigger every month 25 billion facts & relations…

handcrafted – music: CDnow (2410/5), MusicMoz (1073/7)CDnow MusicMoz – biomedical: SNOMED (200k), GO (15k), Emtree(45k+190k Systems biologyGO Systems biology ranging from lightweight Schema.org Schema.org to heavyweight (Cyc (300k)) ranging from small ( METAR ) to large ( UNSPC ) METAR Did semantics get anywhere? Shared vocabularies (2/2)

METAR ontology for pilots

Is anybody using semantics for real? Is anybody using semantics for real?

NXP: data integration about products Triple store Departments Customers

Is there anything we can’t do yet ? Is there anything we can’t do yet ?

heterogeneity Linguistic, Structural, Logical, Statistical,....

Distribution Caching? Payload priority? query- planning?

Provenance Representation? From provenance to trust? (Re)construction?

Dynamics Streams? Non- monotonicity? versioning?

Errors & noise Fuzzy Semantics? Uncertainty Semantics? Rough Semantics? Repair?