OWL 2
Temporalising OWL 2 QL
... In this paper, we investigate the possibility of extending the current W3C stan- dard language OWL 2 QL for ontology-based data access (OBDA) with tempo- ral operators in a way preserving first-order ...
13
Module extraction via query inseparability in OWL 2 QL
... the OWL 2 Web Ontology Language the profile OWL 2 QL, which was designed for OBDA with relational database ...systems. OWL 2 QL is based on a description logic that was ...
12
Conjunctive query inseparability of OWL 2 QL TBoxes
... from OWL 2 QL approximations of 3 commercial software applications called Core, Um- brella and Mimosa (the original ontologies use a few axioms that are not expressible OWL 2 QL ...
16
Answering SPARQL queries over databases under OWL 2 QL entailment regime
... queries.) OWL 2 DL is also vastly superior to OWL 2 QL, but this makes query answering under the OWL 2 direct semantics entailment regime intractable ( CO NP- hard for data ...an ...
29
Theoretically optimal datalog rewritings for OWL 2 QL ontology mediated queries
... by OWL 2 QL ontologies to standard database query ...of OWL 2 QL ontology- mediated queries (OMQs) depending on the existential depth of their ontologies and the shape of their CQs [13, 9, 12, ...
25
On (in)tractability of OBDA with OWL 2 QL
... Theorem 1 means that there are two sources of non-determinism in OBDA with OWL 2 QL: finding a match in the ABox and finding a match in the re- maining tree part of the canonical interpretation. It turns ...
12
Online Full Text
... of OWL has been developed by W3C, it is called ‗OWL 2‘. OWL 2 has much improvement on its predecessor—OWL—especially with rule formulation based on DL SROIQ [11], in which DL ...
6
A User and NLP Assisted Strategic Workflow for a Social Semantic OWL 2 Based Knowledge Platform
... namely OWL 2, this framework comprises: a knowledge base repository to hold the ontological data, rules and axioms, including specialized domain ontologies, and previously defined social semantic ones; a ...
9
Query rewriting over shallow ontologies
... over OWL 2 QL ontologies of depth 1 and 2 by means of a new hyper- graph formalism for computing Boolean ...depth 2 suffer an exponential blowup in the worst case, while first-order rewritings ...
13
Ontology mediated queries: combined complexity and succinctness of rewritings via circuit complexity
... The plan of the article is as follows. Section 2 introduces OWL 2 QL, OMQs and rewritings. Section 3 defines tree-witness rewritings. Section 4 reduces the succinctness problem for OMQ rewritings to ...
71
Temporal description logic for ontology based data access
... language OWL 2 QL, provides basic means for temporal conceptual modelling and ensures first- order rewritability of conjunctive queries for suit- ably defined data instances with validity ...
8
Conjunctive query inseparability in OWL2QL is ExpTime hard
... In this paper, we show that the problem of deciding whether two given OWL 2 QL ontologies return the same answers to any conjunctive query in a given signature is ExpTime -hard. The notion of conjunctive ...
12
First order rewritability of temporal ontology mediated queries
... be used to detect ‘service every 24 hours’ (see below). The queries in our TOMQs range from atoms of the form A(x, t) or P (x, y, t), for A a concept and P a role name, in atomic TOMQs (or TOMAQs), to arbitrary positive ...
8
Games for query inseparability of description logic knowledge bases
... the OWL 2 profiles OWL 2 QL and OWL 2 EL (www.w3.org/TR/owl2-profiles). The algorithms are based on two characterisations of Σ -query inseparability, one of which is ...
50
Ontology based semantic interpretation of cylindricity specification in the next generation GPS
... an OWL 2 ontology by designing a scheme to translate category language to OWL 2 [13], an ontology representation language developed by the World Wide Web Consortium ...
7
THE IMPACT OF LOCATION BASED ATTACKS ON GEOGRAPHICAL ROUTING PROTOCOLS
... property. OWL provides three types of value restrictions for specifying the range of a property when it is used with an instance of a particular class: owl:allValuesFrom, owl:someValuesFrom, and owl:hasValue ...
6
Metamodel transformations between UML and OWL
... This master’s thesis builds on the Linked Energy Data project (LinkED), a col- laboration between TNO 3 , Alliander 4 and Enexis 5 . Within LinkED, a method was developed to transform the static elements of UML class ...
95
An OWL Based Mobile GeoBI Context Ontology Enabling Location Based and Context Based Reasoning and Supporting Contextual Business Analysis
... contexts; 2) the mobile GeoBI context levels organize context into three hierarchical levels, which fits with hu- man perception of space: personal, ambient and surrounding ...
22
In flight RCS measurements of drones and birds at K band and W band
... Table 1 provides a quantitative summary of the RCS values. The table amalgamates data from both hovering and flying drones to demonstrate the dynamic RCS variation. It is seen that for all targets, the modal RCS, maximum ...
12
OWL-Miner: Concept Induction in OWL Knowledge Bases
... generating OWL classes for ontologies from data and existing background knowledge by automating their construction for addition to ontologies, but secondly to leverage these methods to employ OWL as an ...
242