@inbook {814, title = {Seed Patterns for Modeling Trees}, booktitle = {Advances in Pattern-Based Ontology Engineering}, year = {2021}, pages = {48-67}, publisher = {IOS Press}, organization = {IOS Press}, abstract = {Trees {\textendash} i.e., the type of data structure known under this name {\textendash} are central to many aspects of knowledge organization. We investigate some central design choices concerning the ontological modeling of such trees. In particular, we consider the limits of what is expressible in the Web Ontology Language and provide a reusable ontology design pattern for trees.}, author = {Aaron Eberhart and David Carral and Pascal Hitzler and Hilmar Lapp and Sebastian Rudolph} } @mastersthesis {633, title = {Efficient Reasoning Algorithms for Fragments of Horn Description Logics}, volume = {Doctor of Philosophy (PhD)}, year = {2017}, pages = {70}, school = {Wright State University}, address = {Dayton}, abstract = {We characterize two fragments of Horn Description Logics and we define two specialized reasoning algorithms that effectively solve the standard reasoning tasks over each of such fragments. We believe our work to be of general interest since (1) a rather large proportion of real-world Horn ontologies belong to some of these two fragments and (2) the implementations based on our reasoning approach significantly outperform state-of-the-art reasoners. Claims (1) and (2) are extensively proven via empirically evaluation. }, keywords = {Description Logic, Knowledge representation, Reasoning}, url = {http://rave.ohiolink.edu/etdc/view?acc_num=wright1491317096530938}, author = {David Carral} } @conference {653, title = {On the Ontological Modeling of Trees}, booktitle = {8th Workshop on Ontology Design and Patterns - WOP2017}, year = {2017}, author = {David Carral and Pascal Hitzler and Hilmar Lapp and Sebastian Rudolph} } @booklet {586, title = {Rule-based OWL Modeling with ROWLTab Protege Plugin}, year = {2017}, abstract = {

It has been argued that it is much easier to convey logi- cal statements using rules rather than OWL (or description logic (DL)) axioms. Based on recent theoretical developments on transformations between rules and DLs, we have developed ROWLTab, a Prot ́eg ́e plugin that allows users to enter OWL axioms by way of rules; the plugin then automatically converts these rules into OWL 2 DL axioms if possible, and prompts the user in case such a conversion is not possible without weakening the semantics of the rule. In this paper, we present ROWLTab, together with a user evaluation of its effectiveness compared to entering axioms using the standard Prot ́eg ́e interface. Our evaluation shows that modeling with ROWLTab is much quicker than the standard interface, while at the same time, also less prone to errors for hard modeling tasks.

}, author = {Md Kamruzzaman Sarker and Adila Krisnadhi and David Carral and Pascal Hitzler} } @inbook {569, title = {Collected Research Questions Concerning Ontology Design Patterns}, booktitle = {Ontology Engineering with Ontology Design Patterns: Foundations and Applications}, year = {2016}, publisher = {IOS Press}, organization = {IOS Press}, address = {Amsterdam}, author = {Karl Hammar and Eva Blomqvist and David Carral and Marieke van Erp and Antske Fokkens and Aldo Gangemi and Willem Robert van Hage and Pascal Hitzler and Krzysztof Janowicz and Nazifa Karima and Adila Krisnadhi and Tom Narock and Roxane Segers and Monika Solanki and Vojtech Svatek} } @conference {479, title = {The Detector Final State pattern: Using the Web Ontology Language to describe a Physics Analysis}, booktitle = {Presented at the 17th International workshop on Advanced Computing and Analysis Techniques in physics research (ACAT), Valparaiso, Chile, January 2016.}, year = {2016}, note = {

Presented at the\ 17th International workshop on Advanced Computing and Analysis Techniques in physics research (ACAT), Valparaiso, Chile, January 2016.

}, abstract = {

The Data and Software Preservation for Open Science (DASPOS) collaboration has developed an ontology for describing particle physics analyses. The ontology, a series of data triples, is designed to describe dataset, selection cuts, and measured quantities for an analysis. The ontology specification, written in the Web Ontology Language (OWL), is designed to be interpreted by many pre-existing tools, including search engines, and to apply to both theory and experiment published papers. This paper gives an introduction to OWL and this branch of library science from a particle physicist{\textquoteright}s point of view, specifics of the Detector Final State Pattern, and how it is designed to be used in the field of particle physics primarily to archive and recall analyses. A general introduction to DASPOS and how its other work fits in with this topic will also be described.

}, author = {Gordon Watts and Charles Vardeman and David Carral and Pascal Hitzler} } @mastersthesis {589, title = {Efficient Reasoning Algorithms for Fragments of Horn Description Logics}, volume = {PhD}, year = {2016}, school = {Wright State University}, type = {Dissertation}, address = {Dayton, OH, USA}, abstract = {

We characterize two fragments of Horn Description Logics and we define two specialized reasoning algorithms that effectively solve the standard reasoning tasks over each of such fragments. We believe our work to be of general interest since (1) a rather large proportion of real-world Horn ontologies belong to some of these two fragments and (2) the implementations based on our reasoning approach significantly outperform state-of-the-art reasoners. Claims (1) and (2) are extensively proven via empirically evaluation.

}, author = {David Carral} } @conference {572, title = {Modeling OWL with Rules: The ROWL Protege Plugin}, year = {2016}, publisher = {15th International Semantic Web Conference (ISWC) 2016}, organization = {15th International Semantic Web Conference (ISWC) 2016}, address = {Kobe, Japan}, abstract = {

Abstract. In our experience, some ontology users find it much easier to convey logical statements using rules rather than OWL (or description logic) axioms. Based on recent theoretical developments on transformations between rules and description logics, we develop ROWL, a Proteg{\textasciiacute} e plugin that allows users to enter OWL axioms by way of rules; the plugin then automatically converts these rules into OWL DL axioms if possible, and prompts the user in case such a conversion is not possible without weakening the semantics of the rule.

}, url = {http://ceur-ws.org/Vol-1690/paper92.pdf}, author = {Md Kamruzzaman Sarker and David Carral and Adila Krisnadhi and Pascal Hitzler} } @conference {556, title = {A Practical Acyclicity Notion for Query Answering Over Horn-SRIQ Ontologies}, booktitle = {The Semantic Web - {ISWC} 2016 - 15th International Semantic Web Conference, Kobe, Japan, October 17-21, 2016, Proceedings, Part {I}}, year = {2016}, pages = {70{\textendash}85}, abstract = {

Conjunctive query answering over expressive Horn Description Logic ontologies is a relevant and challenging problem which, in some cases, can be addressed by application of the chase algorithm. In this paper, we define a novel acyclicity notion which provides a sufficient condition for termination of the restricted chase over Horn-SRIQ TBoxes. We show that this notion generalizes most of the existing acyclicity conditions (both theoretically and empirically). Furthermore, this new acyclicity notion gives rise to a very efficient reasoning procedure. We provide evidence for this by providing a materialization based reasoner for acyclic ontologies which outperforms other state-of-the-art systems.

}, doi = {10.1007/978-3-319-46523-4_5}, url = {http://dx.doi.org/10.1007/978-3-319-46523-4_5}, author = {David Carral and Cristina Feier and Pascal Hitzler} } @conference {362, title = {The Combined Approach to Query Answering Beyond the OWL 2 Profiles}, booktitle = {Proceedings of the 24th International Joint Conference on Artificial Intelligence (IJCAI)}, year = {2015}, abstract = {

Combined approaches have become a successful technique for CQ answering over ontologies. Existing algorithms, however, are restricted to the logics underpinning the OWL 2 profiles. Our goal is to make combined approaches applicable to a wider range of ontologies. We focus on RSA: a class of Horn ontologies that extends the profiles while ensuring tractability of standard reasoning. We show that CQ answering over RSA ontologies without role composition is feasible in NP. Our reasoning procedure generalises the combined approach for ELHO and DL-LiteR using an encoding of CQ answering into fact entailment w.r.t. a logic program with function symbols and stratified negation. Our results have significant practical implications since many out-of-profile Horn ontologies are RSA.

}, url = {http://www.cs.ox.ac.uk/isg/people/cristina.feier/ijcai_rsafinal.pdf}, author = {Cristina Feier and David Carral and Giorgio Stefanoni and Cuenca Grau, Bernardo and Ian Horrocks} } @conference {363, title = {Extending the Combined Approach Beyond Lightweight Description Logics}, booktitle = {Proceedings of the 28th International Workshop on Description Logics (DL)}, year = {2015}, abstract = {

Combined approaches have become a successful technique for CQ answering over ontologies. Existing algorithms, however, are restricted to the logics underpinning the OWL 2 profiles. Our goal is to make combined approaches applicable to a wider range of ontologies. We focus on RSA: a class of Horn ontologies that extends the profiles while ensuring tractability of standard reasoning. We show that CQ answering over RSA ontologies without role composition is feasible in NP. Our reasoning procedure generalises the combined approach for ELHO and DL-LiteR using an encoding of CQ answering into fact entailment w.r.t. a logic program with function symbols and stratified negation. Our results are significant in practice since many out-of-profile Horn ontologies are RSA.

}, url = {http://www.cs.ox.ac.uk/isg/people/cristina.feier/pdfs/dlmain.pdf}, author = {Cristina Feier and David Carral and Giorgio Stefanoni and Cuenca Grau, Bernardo and Ian Horrocks} } @conference {414, title = {An Ontology Design Pattern for Data Integration in the Library Domain}, booktitle = {Proceedings of the 6th Workshop on Ontology and Semantic Web Patterns (WOP2015) co-located with the 14th International Semantic Web Conference (ISWC 2015), Bethlehem, PA, USA, October 11, 2015}, year = {2015}, month = {10/2015}, abstract = {

A university{\textquoteright}s institutional repository (IR) contains the in- tellectual output of its faculty, staff and students. Its content is exten- sive and heterogenous, which complicates data aggregation and discovery tasks. To address these challenges, we propose the use of a conceptual ontology design pattern to model information for the IR domain which is general enough to be reused across different IR datasets.

}, author = {Patrick Obrien and David Carral and Jeff Mixter and Pascal Hitzler} } @conference {386, title = {An Ontology Design Pattern for Particle Physics Analysis}, booktitle = {Proceedings of the 6th Workshop on Ontology and Semantic Web Patterns (WOP 2015) co-located with the 14th International Semantic Web Conference (ISWC 2015), Bethlehem, Pensylvania, USA, October 11, 2015}, volume = {1461}, year = {2015}, month = {10/2015}, publisher = {CEUR-WS.org}, organization = {CEUR-WS.org}, abstract = {

The detector final state is the core element of particle physics analysis as it defines the physical characteristics that form the basis of the measurement presented in a published paper. Although they are a crucial part of the research process, detector final states are not yet formally described, published in papers or searchable in a convenient way. This paper aims at providing an ontology pattern for the detector final state that can be used as a building block for an ontology covering the whole particle physics analysis life cycle.

}, url = {http://ceur-ws.org/Vol-1461/WOP2015_pattern_abstract_5.pdf}, author = {David Carral and Michelle Cheatham and Sunje Dallmeir-Tiessen and Patricia Herterich and Michael D. Hildreth and Pascal Hitzler and Adila Krisnadhi and Kati Lassila-Perini and Elizabeth Sexton-Kennedy and Charles Vardeman and Gordon Watts}, editor = {Eva Blomqvist and Pascal Hitzler and Adila Krisnadhi and Thomas Narock and Monika Solanki} } @conference {133, title = {All But Not Nothing: Left-Hand Side Universals for Tractable {OWL} Profiles}, booktitle = {Proceedings of the 11th International Workshop on OWL: Experiences and Directions (OWLED 2014) co-located with 13th International Semantic Web Conference on (ISWC 2014), Riva del Garda, Italy, October 17-18, 2014.}, volume = {1265}, year = {2014}, month = {10/2014}, pages = {97-108}, publisher = {CEUR-WS.org}, organization = {CEUR-WS.org}, abstract = {We show that occurrences of the universal quantifier in the left-hand side of general concept inclusions can be rewritten into EL++ axioms under certain circumstances. I.e., this intuitive modeling feature is available for OWL EL while retaining tractability. Furthermore, this rewriting makes it possible to reason over corresponding extensions of EL++ and Horn-SROIQ using standard reasoners.}, keywords = {description logics, Horn Logics, OWL}, url = {http://ceur-ws.org/Vol-1265/owled2014_submission_13.pdf}, author = {David Carral and Adila Krisnadhi and Sebastian Rudolph and Pascal Hitzler}, editor = {C. Maria Keet and Valentina A. M. Tamma} } @conference {135, title = {EL-ifying Ontologies}, booktitle = {Automated Reasoning - 7th International Joint Conference, IJCAR 2014, Held as Part of the Vienna Summer of Logic, {VSL} 2014, Vienna, Austria, July 19-22, 2014. Proceedings}, year = {2014}, pages = {464{\textendash}479}, abstract = {

The OWL 2 profiles are fragments of the ontology language OWL 2 for which standard reasoning tasks are feasible in polynomial time. Many OWL ontologies, however, contain a typically small number of out-of-profile axioms, which may have little or no influence on reasoning outcomes. We investigate techniques for rewriting axioms into the EL and RL profiles of OWL 2. We have tested our techniques on both classification and data reasoning tasks with encouraging results.

}, keywords = {description logics, OWL, Rewriting, Tractable Reasoning}, doi = {10.1007/978-3-319-08587-6_36}, url = {http://dx.doi.org/10.1007/978-3-319-08587-6_36}, author = {David Carral and Cristina Feier and Cuenca Grau, Bernardo and Pascal Hitzler and Ian Horrocks} } @conference {132, title = {An Ontology Design Pattern for Activity Reasoning}, booktitle = {Proceedings of the 5th Workshop on Ontology and Semantic Web Patterns (WOP2014) co-located with the 13th International Semantic Web Conference {(ISWC} 2014), Riva del Garda, Italy, October 19, 2014.}, year = {2014}, pages = {78{\textendash}81}, abstract = {

Activity is an important concept in many fields, and a number of activity-related ontologies have been developed. While suitable for their designated use cases, these ontologies cannot be easily generalized to other applications. This paper aims at providing a generic ontology design pattern to model the common core of activities in different domains. Such a pattern can be used as a building block to construct more specific activity ontologies.

}, keywords = {Activity, Ontology Design Pattern, OWL}, url = {http://ceur-ws.org/Vol-1302/paper8.pdf}, author = {Amin Abdalla and Yingjie Hu and David Carral and Naicong Li and Krzysztof Janowicz} } @conference {131, title = {Pushing the Boundaries of Tractable Ontology Reasoning}, booktitle = {The Semantic Web - ISWC 2014 - 13th International Semantic Web Conference, Riva del Garda, Italy, October 19-23, 2014. Proceedings, Part II}, year = {2014}, pages = {148{\textendash}163}, abstract = {

We identify a class of Horn ontologies for which standard reasoning tasks such as instance checking and classification are tractable. The class is general enough to include the OWL 2 EL, QL, and RL profiles. Verifying whether a Horn ontology belongs to the class can be done in polynomial time. We show empirically that the class includes many real-world ontologies that are not included in any OWL 2 profile, and thus that polynomial time reasoning is possible for these ontologies.

}, keywords = {description logics, OWL, Tractable Reasoning}, doi = {10.1007/978-3-319-11915-1_10}, url = {http://dx.doi.org/10.1007/978-3-319-11915-1_10}, author = {David Carral and Cristina Feier and Cuenca Grau, Bernardo and Pascal Hitzler and Ian Horrocks} } @conference {134, title = {Is Your Ontology as Hard as You Think? Rewriting Ontologies into Simpler DLs}, booktitle = {Informal Proceedings of the 27th International Workshop on Description Logics, Vienna, Austria, July 17-20, 2014.}, year = {2014}, pages = {128{\textendash}140}, abstract = {

We investigate cases where an ontology expressed in a seemingly hard DL can be polynomially reduced to one in a simpler logic, while preserving reasoning outcomes for classification and fact entailment. Our transformations target the elimination of inverse roles, universal and existential restrictions, and in the best case allow us to rewrite the given ontology into one of the OWL 2 profiles. Even if an ontology cannot be fully rewritten into a profile, in many cases our transformations allow us to exploit further optimisation techniques. Moreover, the elimination of some out-of-profile axioms can improve the performance of modular reasoners, such as MORe. We have tested our techniques on both classification and data reasoning tasks with encouraging results.

}, keywords = {description logics, OWL, Tractable Reasoning}, url = {http://ceur-ws.org/Vol-1193/paper_75.pdf}, author = {David Carral and Cristina Feier and Ana Armas Romero and Cuenca Grau, Bernardo and Pascal Hitzler and Ian Horrocks} } @conference {130, title = {A Geo-ontology Design Pattern for Semantic Trajectories}, booktitle = {Spatial Information Theory - 11th International Conference, COSIT 2013, Scarborough, UK, September 2-6, 2013. Proceedings}, year = {2013}, pages = {438{\textendash}456}, abstract = {

Trajectory data have been used in a variety of studies, including human behavior analysis, transportation management, and wildlife tracking. While each study area introduces a different perspective, they share the need to integrate positioning data with domain-specific information. Semantic annotations are necessary to improve discovery, reuse, and integration of trajectory data from different sources. Consequently, it would be beneficial if the common structure encountered in trajectory data could be annotated based on a shared vocabulary, abstracting from domain-specific aspects. Ontology design patterns are an increasingly popular approach to define such flexible and self-contained building blocks of annotations. They appear more suitable for the annotation of interdisciplinary, multi-thematic, and multi-perspective data than the use of foundational and domain ontologies alone. In this paper, we introduce such an ontology design pattern for semantic trajectories. It was developed as a community effort across multiple disciplines and in a data-driven fashion. We discuss the formalization of the pattern using the Web Ontology Language (OWL) and apply the pattern to two different scenarios, personal travel and wildlife monitoring.

}, keywords = {Ontology Design Pattern, OWL, Trajectory}, doi = {10.1007/978-3-319-01790-7_24}, url = {http://dx.doi.org/10.1007/978-3-319-01790-7_24}, author = {Yingjie Hu and Krzysztof Janowicz and David Carral and Simon Scheider and Werner Kuhn and Gary Berg-Cross and Pascal Hitzler and Mike Dean and Dave Kolas} } @conference {129, title = {An Ontology Design Pattern for Cartographic Map Scaling}, booktitle = {The Semantic Web: Semantics and Big Data, 10th International Conference, ESWC 2013, Montpellier, France, May 26-30, 2013. Proceedings}, volume = {7882}, year = {2013}, pages = {76{\textendash}93}, publisher = {Springer}, organization = {Springer}, abstract = {

The concepts of scale is at the core of cartographic abstraction and mapping. It defines which geographic phenomena should be displayed, which type of geometry and map symbol to use, which measures can be taken, as well as the degree to which features need to be exaggerated or spatially displaced. In this work, we present an ontology design pattern for map scaling using the Web Ontology Language (OWL) within a particular extension of the OWL RL profile. We explain how it can be used to describe scaling applications, to reason over scale levels, and geometric representations. We propose an axiomatization that allows us to impose meaningful constraints on the pattern, and, thus, to go beyond simple surface semantics. Interestingly, this includes several functional constraints currently not expressible in any of the OWL profiles. We show that for this specific scenario, the addition of such constraints does not increase the reasoning complexity which remains tractable.

}, keywords = {Map Scaling, Ontology Design Patterns, OWL}, doi = {10.1007/978-3-642-38288-8_6}, url = {http://dx.doi.org/10.1007/978-3-642-38288-8_6}, author = {David Carral and Simon Scheider and Krzysztof Janowicz and Charles Vardeman and Adila Krisnadhi and Pascal Hitzler}, editor = {Philipp Cimiano and {\'O}scar Corcho and Valentina Presutti and Laura Hollink and Sebastian Rudolph} } @conference {21, title = {SROIQ Syntax Approximation by Using Nominal Schemas}, booktitle = {Informal Proceedings of the 26th International Workshop on Description Logics, Ulm, Germany, July 23 - 26, 2013}, year = {2013}, pages = {988{\textendash}999}, url = {http://ceur-ws.org/Vol-1014/paper_31.pdf}, author = {Cong Wang and David Carral and Pascal Hitzler} } @conference {128, title = {Towards an Efficient Algorithm to Reason over Description Logics Extended with Nominal Schemas}, booktitle = {Web Reasoning and Rule Systems - 7th International Conference, {RR} 2013, Mannheim, Germany, July 27-29, 2013. Proceedings}, year = {2013}, pages = {65{\textendash}79}, abstract = {

Extending description logics with so-called nominal schemas has been shown to be a major step towards integrating description logics with rules paradigms. However, establishing efficient algorithms for reasoning with nominal schemas has so far been a challenge. In this paper, we present an algorithm to reason with the description logic fragment ELROVn, a fragment that extends EL++ with nominal schemas. We also report on an implementation and experimental evaluation of the algorithm, which shows that our approach is indeed rather efficient.

}, keywords = {description logics, EL++, Nominal Schemas}, doi = {10.1007/978-3-642-39666-3_6}, url = {http://dx.doi.org/10.1007/978-3-642-39666-3_6}, author = {David Carral and Cong Wang and Pascal Hitzler} } @conference {127, title = {Extending Description Logic Rules}, booktitle = {The Semantic Web: Research and Applications - 9th Extended Semantic Web Conference, ESWC 2012, Heraklion, Crete, Greece, May 27-31, 2012. Proceedings}, year = {2012}, pages = {345{\textendash}359}, abstract = {

Description Logics {\textendash} the logics underpinning the Web Ontology Language OWL {\textendash} and rules are currently the most prominent paradigms used for modeling knowledge for the Semantic Web. While both of these approaches are based on classical logic, the paradigms also differ significantly, so that naive combinations result in undesirable properties such as undecidability. Recent work has shown that many rules can in fact be expressed in OWL. In this paper we extend this work to include some types of rules previously excluded. We formally define a set of first order logic rules, C-Rules, which can be expressed within OWL extended with role conjunction. We also show that the use of nominal schemas results in even broader coverage.

}, keywords = {description logics, OWL, Rules}, doi = {10.1007/978-3-642-30284-8_30}, url = {http://dx.doi.org/10.1007/978-3-642-30284-8_30}, author = {David Carral and Pascal Hitzler} } @conference {125, title = {Integrating {OWL} and Rules: A Syntax Proposal for Nominal Schemas}, booktitle = {Proceedings of OWL: Experiences and Directions Workshop 2012, Heraklion, Crete, Greece, May 27-28, 2012}, volume = {849}, year = {2012}, month = {05/2012}, publisher = {CEUR-WS.org}, organization = {CEUR-WS.org}, abstract = {This paper proposes an addition to OWL 2 syntax to incorporate nominal schemas, which is a new description-logic style extension of OWL 2 which was recently proposed, and which makes is possible to express {\textquotedblleft}variable nominal classes{\textquotedblright} within axioms in an OWL 2 ontology. Nominal schemas make it possible to express DL-safe rules of arbitrary arity within the extended OWL paradigm, hence covering the well-known DL-safe SWRL language. To express this feature, we extend OWL 2 syntax to include necessary and minimal modifications to both Functional and Manchester syntax grammars and mappings from these two syntaxes to Turtle/RDF. We also include several examples to clarify the proposal.}, url = {http://ceur-ws.org/Vol-849/paper_6.pdf}, author = {David Carral and Adila Krisnadhi and Pascal Hitzler}, editor = {Pavel Klinov and Matthew Horridge} } @conference {170, title = {Konf Connect}, booktitle = {Metadata Challenge at the 21st International Conference on World Wide Web (WWW 2012)}, year = {2012}, address = {Lyon, France}, abstract = {

We present an application called Konf-Connect to improve\ the conference attending experience of the people who attend a conference. This tool provides search facilities to nd people with similar\ interests. The application makes use of Semantic Web dog food dataset\ to gather information regarding the conference at hand. This is helpful for people attending the conference who are looking for networking\ opportunities with people having expertise in the specic areas of interest. The application can also be extended to be used as general purpose\ expert search system.

}, author = {David Carral and Joshi, Amit Krishna and Adila Krisnadhi and Raghava Mutharaju and Kunal Sengupta and Cong Wang} } @conference {126, title = {A logical geo-ontology design pattern for quantifying over types}, booktitle = {SIGSPATIAL 2012 International Conference on Advances in Geographic Information Systems (formerly known as GIS), SIGSPATIAL{\textquoteright}12, Redondo Beach, CA, USA, November 7-9, 2012}, year = {2012}, pages = {239{\textendash}248}, keywords = {Biodiversity, description logics, Ontology Design Patterns, OWL}, doi = {10.1145/2424321.2424352}, url = {http://doi.acm.org/10.1145/2424321.2424352}, author = {David Carral and Krzysztof Janowicz and Pascal Hitzler} } @article {216, title = {Reasoning Approaches for Nominal Schemas}, volume = {Poster and Demonstration Proceedings}, year = {2012}, publisher = {JIST}, address = {Nara, Japan}, author = {Cong Wang and Adila Krisnadhi and David Carral and Pascal Hitzler} } @conference {124, title = {Recent Advances in Integrating {OWL} and Rules}, booktitle = {Web Reasoning and Rule Systems - 6th International Conference, RR 2012, Vienna, Austria, September 10-12, 2012. Proceedings}, volume = {7497}, year = {2012}, month = {09/2012}, pages = {225-228}, publisher = {Springer}, organization = {Springer}, address = {Austria, Vienna}, abstract = {As part of the quest for a unifying logic for the Semantic Web Technology Stack, a central issue is finding suitable ways of integrating description logics based on the Web Ontology Language (OWL) with rule-based approaches based on logic programming. Such integration is difficult since naive approaches typically result in the violation of one or more desirable design principles. For example, while both OWL 2 DL and RIF Core (a dialect of the Rule Interchange Format RIF) are decidable, their naive union is not, unless carefully chosen syntactic restrictions are applied. We report on recent advances and ongoing work by the authors in integrating OWL and rulesWe take an OWL-centric perspective, which means that we take OWL 2 DL as a starting point and pursue the question of how features of rulebased formalisms can be added without jeopardizing decidability. We also report on incorporating the closed world assumption and on reasoning algorithms. This paper essentially serves as an entry point to the original papers, to which we will refer throughout, where detailed expositions of the results can be found.}, keywords = {description logics, OWL, Rules}, doi = {10.1007/978-3-642-33203-6_20}, url = {http://dx.doi.org/10.1007/978-3-642-33203-6_20}, author = {Matthias Knorr and David Carral and Pascal Hitzler and Adila Krisnadhi and Frederick Maier and Cong Wang}, editor = {Markus Kr{\"o}tzsch and Umberto Straccia} }