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Computing Solutions in OWL 2 QL Knowledge Exchange

Marcelo Arenas, Elena Botoeva, Diego Calvanese, Vladislav Ryzhikov
2013 International Workshop on Description Logics  
In this paper, we study this problem for knowledge bases and mappings expressed in OWL 2 QL, one of the profiles of the standard Web Ontology Language OWL 2.  ...  We study two settings: when ABoxes are in OWL 2 QL and when null values are allowed in the ABox language.  ...  Obviously, we can construct the required A 2 in PTIME, then it remains to check if K 2 above is a universal solution. It follows:  ... 
dblp:conf/dlog/ArenasBCR13 fatcat:3htadt4znvf65epzs4sjndogdm

Using OWL in Data Integration [chapter]

Diego Calvanese, Giuseppe De Giacomo, Domenico Lembo, Maurizio Lenzerini, Riccardo Rosati, Marco Ruzzi
2009 Semantic Web Information Management  
In particular, we adopt OWL 2 QL as the ontology language used to express the global schema.  ...  OWL 2 QL is one of the tractable profiles of OWL 2, and essentially corresponds to a member of the DL-Lite family, a family of Description Logics designed to have a good trade-off between expressive power  ...  global schema is expressed instead in OWL 2 QL.  ... 
doi:10.1007/978-3-642-04329-1_17 fatcat:tll42v56mzfbfmditjlz56j7uq

On the Top-k Retrieval Problem for Ontology-Based Access to Databases [chapter]

Umberto Straccia
2013 Studies in Computational Intelligence  
The chapter is a succinct summary on the problem of evaluating ranked top-k queries in the context of ontology-based access over relational databases.  ...  OWL 2 EL, OWL 2 QL and OWL 2 RL only.  ...  So far, for the languages RDFS, OWL QL, OWL EL and RIF ad hoc solution have been worked out, while for OWL RL a reduction to RIF is required.  ... 
doi:10.1007/978-3-319-00954-4_5 fatcat:wq725kq5svcedjietrtez3rsaq

Extending NoHR for OWL 2 QL

Nuno Costa, Matthias Knorr, João Leite
2015 International Joint Conference on Artificial Intelligence  
In this paper, we provide the nontrivial solution for the extension of NoHR to OWL 2 QL by directly translating the ontology into rules without any prior pre-processing or classification.  ...  Yet, a straightforward adaptation of the existing approach to OWL 2 QL turns out to not be viable.  ...  Conclusions We have extended NoHR, the Protégé plug-in that allows to query non-monotonic rules and ontologies in OWL 2 EL, to also admit ontologies in OWL 2 QL.  ... 
dblp:conf/ijcai/CostaKL15 fatcat:72v7jq34ljbormnlzkotvvtaxi

SeDAn: a Plausible Reasoning Approach for Semantics-based Data Analytics in Healthcare

Hossein Mohammadhassanzadeh, Samina Raza Abidi, Mohammad Salman Shah, Mehdi Karamollahi, Syed Sibte Raza Abidi
2017 International Conference of the Italian Association for Artificial Intelligence  
Plausible Reasoning (PR) is an inferencing mechanism to derive solutions when dealing with incomplete knowledge.  ...  In particular, we will evaluate the efficacy of the proposed framework in healthcare to perform effective semantic analytics using partial health data to make better decisions in disease diagnosis and  ...  The OWA made in DLs makes OWL 2 QL suitable to work with incomplete knowledge in the SW scenarios [14] , [15] .  ... 
dblp:conf/aiia/Mohammadhassanzadeh17 fatcat:ttn3edt53zeypbrovw2v7f2w6a

Conjunctive Query Inseparability in OWL 2 QL is ExpTime-hard

Roman Kontchakov, Vladislav Ryzhikov, Michael Zakharyaschev
2013 International Workshop on Description Logics  
Here we show that the problem is ExpTime-complete and, in fact, deciding whether two OWL 2 QL knowledge bases (each with its own data) give the same answers to any conjunctive query is ExpTime-hard.  ...  We settle an open question on the complexity of the following problem: given two OWL 2 QL TBoxes and a signature, decide whether these TBoxes return the same answers to any conjunctive query over any data  ...  Conclusion In this paper, we have proved that the Σ-query entailment and inseparability problems for both OWL 2 QL KBs and TBoxes are ExpTime-hard.  ... 
dblp:conf/dlog/KontchakovRZ13 fatcat:lehpynjm4remdfh3fcxqwibfpq

Dynamic discovery and coordination of agent-based semantic web services

K. Sycara, M. Paolucci, J. Soudry, N. Srinivasan
2004 IEEE Internet Computing  
In this article, the authors focus on the broker, analyzing both its interaction protocol and reasoning tasks.  ...  Both have performance trade-offs, but the Web Ontology Language for Semantic Web Services (OWL-S) can handle extensions that address some of the shortcomings.  ...  ϕ ϕ → Π E P IEEE INTERNET COMPUTING MAY • JUNE 2004 71 1 . 1 KB = knowledge from query 2.  ... 
doi:10.1109/mic.2004.1297276 fatcat:ogiec5avkjegvdjd6n4o2yfpwm

Towards a Scalable and Efficient Middleware for Instance Retrieval Inference Services

Atila Kaya, Ralf Möller, Alissa Kaplunova, Tobias Berger
2007 W3C Web Ontology Language (OWL) Experiences and Directions Workshop (OWLED)  
Tobias Berger has been supported by a DAAD (German Academic Exchange Service) scholarship.  ...  OWL-QL defines a protocol for query-answering dialogs among agents using knowledge represented in OWL.  ...  The OWL Query Language (OWL-QL) is a query language and communication protocol for instance retrieval [6] .  ... 
dblp:conf/owled/KayaMKB07 fatcat:jnpkw7gokngnjdwftnlfoul2wa

Transferring Remote Ontologies to the Edge of Internet of Things Systems [chapter]

Xiang Su, Pingjiang Li, Huber Flores, Jukka Riekki, Xiaoli Liu, Yuhong Li, Christian Prehofer
2017 Lecture Notes in Computer Science  
This paper presents different representations for transferring Web Ontology language (OWL) version 2 ontologies to the edge.  ...  We evaluate different representations in an experimental IoT system with edge nodes and compare lengths of different syntaxes and their computation effort of building models in Cloud and edge computing  ...  The components in IoT systems could reach a shared understanding by exchanging knowledge.  ... 
doi:10.1007/978-3-319-57186-7_39 fatcat:pnn6rshl7jczfgujwokifd74x4

OWL 2 Profiles: An Introduction to Lightweight Ontology Languages [chapter]

Markus Krötzsch
2012 Lecture Notes in Computer Science  
This chapter gives an extended introduction to the lightweight profiles OWL EL, OWL QL, and OWL RL of the Web Ontology Language OWL.  ...  To this end, we recall the relationship between OWL and description logics (DLs), and show how each of the profiles is typically treated in reasoning algorithms. Example 2.  ...  Errata, if any, will be published at 2 Profiles. Feedback can be sent to the author.  ... 
doi:10.1007/978-3-642-33158-9_4 fatcat:2mzzdbq62babbntnyjltxi7gly

An Architecture for a Context-aware Service Broker in Ubiquitous Computing Environments

Y.G. Saffar, H. Abolhassani, R. Jalili
2006 IEEE International Conference on Computer Systems and Applications, 2006.  
In ubiquitous computing environments, many devices and agents interoperate with each other and uses services provided by others.  ...  A solution to this problem is to use service brokers that compose existing services and create new value added services that can fulfill the clients' requests.  ...  Another more flexible method for specifying the request is using OWL-QL [23] .  ... 
doi:10.1109/aiccsa.2006.205223 dblp:conf/aiccsa/SaffarAJ06 fatcat:l44ckkp2xvc6vcgvckn63s2nti

Adoption of the Semantic Web for overcoming technical limitations of knowledge management systems

Jaehun Joo, Sang M. Lee
2009 Expert systems with applications  
New information technology is a core factor enabling innovation in knowledge management (KM).  ...  On the other hand, incongruence and untrustworthiness of knowledge were significant limitation factors for knowledge quality.  ...  Protégé-2000 supports RQL and Sesame supports both RQL and RDQL OWL-QL OWL-query language (OWL-QL) is the OWL query language that is a candidate standard language and protocol for query-answering dialogues  ... 
doi:10.1016/j.eswa.2008.09.005 fatcat:4gfk3gaw3jch5hvkjvca5igm4q

Development of a Logic Layer in the Semantic Web: Research Issues

Naeem Khalid Janjua, Farookh Khadeer Hussain
2010 2010 Sixth International Conference on Semantics, Knowledge and Grids  
The ontology layer of the semantic web is now mature enough (i.e. standards like RDF, RDFs, OWL, OWL 2) and the next step is to work on a logic layer for the development of advanced reasoning capabilities  ...  for knowledge extraction and efficient decision making.  ...  OWL 2 is also available in three variants: OWL 2 EL, OWL 2 QL and OWL 2 RL [13] .  ... 
doi:10.1109/skg.2010.61 dblp:conf/skg/JanjuaH10 fatcat:ln3pql6ftzhmzf4x6uuq232mwm

A survey of large-scale reasoning on the Web of data

Grigoris Antoniou, Sotiris Batsakis, Raghava Mutharaju, Jeff Z. Pan, Guilin Qi, Ilias Tachmazidis, Jacopo Urbani, Zhangquan Zhou
2018 Knowledge engineering review (Print)  
These systems differ significantly; for instance in terms of reasoning expressivity, computational properties such as completeness, or reasoning objectives.  ...  In this large and uncoordinated environment, reasoning can be used to check the consistency of the data and of associated ontologies, or to infer logical consequences which, in turn, can be used to obtain  ...  OWL 2 Profiles The OWL standardization provides three sets of syntactic restrictions that trade some expressivity in order to improve the computational complexity. These are: • OWL QL.  ... 
doi:10.1017/s0269888918000255 fatcat:bergc5uphbceznigppektgvzrm

Evaluation Performance of ELK Reasoner for Semantic Ontology Based Heterogeneous Data Framework in E-Learning Environment

2019 jecet  
or system represent the same data and information but in very different data formats.  ...  The aim of this research is to evaluate the performance of ELK reasoner based on OWL 2EL that using the consequences algorithm on heterogeneity data of e-learning environment.  ...  The standard profiles: OWL 2 EL, OWL 2 QL, and OWL 2 RL are targeted at various application areas [21, 23] .  ... 
doi:10.24214/jecet.b.8.4.30115 fatcat:xlv32vxtrffpvjzi5ejhr7sch4
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