[PDF] Top 20 Ontology based data access: a survey

... the data complexity of answering individual OMQs in this non-uniform approach was launched by Lutz and Wolter [2017] and Bienvenu et .../NL/P data complexity trichotomy for OMQs with EL ontologies and ... See full document

... for data complexity and PS PACE -complete for combined complexity (even NP-complete if the arity of predicates is ...log data stored in databases as ...datalogMTL ontology for temporal con- cepts ... See full document

... We show that OBDA languages based on atomic queries capture CSPs (and general- izations thereof). The proofs employ the equivalences between OBDA languages and fragments of MDDlog that have already been ... See full document

... With access to more normalized structured data free of multi-valued fields, it becomes possible to consider converting Bio2RDFdatasets into full-fledged OWL ...the data itself, as was demonstrated in ... See full document

... Ontology-based data access (OBDA), one of the most promis- ing applications of description logics, has recently been touted as a key ingredient in data stream management systems [Cal- ... See full document

... The temporal extension TQL of OWL 2 QL we present here is interpreted over sequences I(n), n ∈ Z, of standard DL structures reflecting possible evolutions of data. TBox axioms are interpreted globally, that is, ... See full document

... Practical ontology-mediated query answering with temporal ontologies based on the Halpern–Shoham interval temporal logic, HS (Halpern and Shoham, 1991) was investigated by Kontchakov et ...historical ... See full document

... the data stored in each node in the path ranging from the root node to the corresponding terminal ...the data stored in this set as the updated key to each user in the ...the data generator intends ... See full document

... differential access rights to individual users based on the users’ ...stores data from senders and provide corresponding access to ...or data (e.g., a commander) and wishes to store ... See full document

... growing data on the web has created a big challenge for directing the user to the web pages in their areas of ...interest based on user’s previous ...Text based sentiment classifiers often prove ... See full document

... One of the main differences between description logics and first-order logic is that the former do not use individual variables. Instead, description logic constructors such as existential restrictions express certain ... See full document

... of ontology can be seen in many fields of technological ...to ontology are Ontology Lookup service ,Gene Ontology Consortium, Sequence Ontology, Generic Model Organism Databases, ... See full document

... grained access control on outsourced data can be ...enforce access control and it can protect data encryption key of data ...enable data owner to delegate the computation ... See full document

... In the following examples, we use a geographic database with data about inhabitance control in Paraiba state (stored in PostGIS). Its scheme was previously mapped to a peer ontology representation. ... See full document

... In Section 3, we evaluate the performance of Ontop and compare it with other systems using a number of standard ontologies, including LUBM with generated data and the Movie Ontology with real data. ... See full document

... accessing data is one of the most exciting new applications of description logics in databases and other information ...tology-based data access in practice is by reduc- tion to querying ... See full document

... problem, Ontology-Based Data Access (OBDA) was proposed in 2000s, which provides a conceptual layer in the form of an ontologyfor user ...The ontology defines a shared vocabulary,models ... See full document

... an ontology during the query formulation ...2 ontology without requiring any domain specific configuration; however, one could still implement domain specific widgets, similar to our map widget, to offer ... See full document

... Epicentre data model, relationships are represented as attributes of entities (with collections of instances as possible values), so entities at both end-points of a relationship have a respective attribute: one ... See full document

... instance data is often time-dependent: em- ployment contracts come to an end, parliaments are elected, children are ...Temporal data can be modelled by pairs consisting of facts and their validity time; for ... See full document