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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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Medicin is organised by organ

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CS is organised as a stack Semantics increases Dicks career

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CS is organised as a stack

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

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http://www.youtube.com/watch?v=tBSdYi4EY3s

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P1. Give all things a name

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P2. Relations form a graph between things

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

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P1+P2+P3 = Giant Global Graph

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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

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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

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Did semantics get anywhere? Did semantics get anywhere?

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Did semantics get anywhere? already many billions of facts & rules Encyclopedia Geographic names (millions) names of artists & art works (10.000s) 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 + 140 million interlinks May 09 estimate > 4.2 billion triples + 140 million interlinks basic facts on every country on the planet common sense rules & facts (100.000s)

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It gets bigger every month 25 billion facts & relations

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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)

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METAR ontology for pilots

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

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NXP: data integration about 26.000 products Triple store Departments Customers

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Is there anything we cant do yet ? Is there anything we cant do yet ?

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

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Distribution Caching? Payload priority? query- planning?

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

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Dynamics Streams? Non- monotonicity? versioning?

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

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