Part II: OWL - Foundations of Semantic Web Technologies

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Contents OWL – Basic Ideas OWL As the Description Logic SROIQ(D) Different Perspectives on OWL Expressivity Examples: Rules in OWL OWL Semantics OWL Profiles Proof Theory Tools Outlook References 34
OWL Semantics There are two semantics for OWL. 1. Description Logic Semantics also: Direct Semantics; FOL Semantics Can be obtained by translation to FOL. Syntax restrictions apply! (see next slide) 2. RDF-based Semantics No syntax restrictions apply. Extends the direct semantics with RDFS-reasoning features. In the following, we will deal with the direct semantics only. 35
Page 1 and 2: Semantic Web Modelling Languages (P
Page 3 and 4: OWL - Overview Web Ontology Languag
Page 5 and 6: References - Textbooks Pascal Hitzl
Page 7 and 8: Contents OWL - Basic Ideas OWL As t
Page 9 and 10: OWL Building Blocks individuals (wr
Page 11 and 12: DL syntax RDFS syntax Person(mary)
Page 13 and 14: Class constructors conjunction Moth
Page 17 and 18: Understanding SROIQ(D) ALC + role c
Page 19 and 20: Understanding SROIQ(D) I - inverse
Page 21 and 22: Understanding SROIQ(D) (D) - dataty
Page 23 and 24: Understanding SROIQ(D) further expr
Page 25 and 26: Some Syntactic Sugar in OWL This ap
Page 27 and 28: OWL - Extralogical Features OWL ont
Page 29 and 30: The RDFS perspective RDFS semantics
Page 33: Expressivity Examples: Rules in OWL
Page 37 and 38: OWL Direct Semantics: Restrictions
Page 39 and 40: OWL Direct Semantics model-theoreti
Page 41 and 42: OWL Direct Semantics via FOL but of
Page 43 and 44: OWL Profiles OWL Full - using the R
Page 45 and 46: OWL 2 RL motivated by the question:
Page 47 and 48: OWL 2 QL motivated by the question:
Page 49 and 50: Proof Theory Traditionally using ta
Page 51 and 52: DL Tableaux Termination Problem TBo
Page 53 and 54: Blocking (in ALC) y is blocked (by
Page 55 and 56: ALC Tableau Example TBox: ¬C t ∀
Page 57 and 58: OWL tools (incomplete listing) Reas
Page 59 and 60: Some Current Research Questions Int
Page 61 and 62: Suggestions for OWL? Annual Worksho
Page 63 and 64: Main References W3C OWL Working Gro
Page 65 and 66: Further References DL complexity ca

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