At least for this rst version, the aim is for a semesterlong. Web ontology language owl is an ontology language designed for the semantic web it provides a rich collection of operators for forming concept descriptions it is a w3c standard, promoting interoperation and sharing between applications. In encyclopedia of information science and technology, information science reference, pennsylvania, usa, 2007. Owl is developed as a vocabulary extension of rdf the resource description. In this paper we describe racer, which can be considered as a core inference engine for the semantic web. Introduction the web ontology language owl has been a w3c. The owl 2 web ontology language, informally owl 2, is an ontology language for the semantic web with formally defined meaning. The protegeowl ontology editing tool provides a query facility that allows composition and execution of queries with the humanreadable manchester owl syntax, with.
Dec 11, 2012 the owl 2 web ontology language, informally owl 2, is an ontology language for the semantic web with formally defined meaning. Most web ontology languages are founded on resource description framework rdf 4 and its subsequent extension, resource description framework schema rdfs. The owl ontology describe the hierarchical organization of ideas in a domain, in a way that can be parsed and understood by software. In order to regain computational e ciency, owl dl short for. Representing information using the web ontology language. Gene ontology annotations and resources nucleic acids. Incremental language description of owl dl and owl full4. The ontology of clinical research ocre is an owl 2 model of the entities and relationships of study design protocols for the purpose of computationally supporting the design and analysis of human studies. Chapter 1 introduction financial regulation ontology.
As to how comprehensive an introduction to ontology engineering should be, there is no good answer. Web ontology language owl semantics an owl ontology comprises. The key references for owl at the date of writing, april 2003. Web ontology language owl semantics for example, we can state in our ontology. This book introduces the subject of ontology, owl, and shows how it can revolutionize the way we use computers. Owl web ontology language guide world wide web consortium. Owl 2 web ontology language quick reference guide second. There are a number of such languages for ontologies, both proprietory and standardbased such as common algebraic specification language, common logic, cycl, dogma, gellish, idef5, kif, rif, and owl. The owl web ontology language is a new formal language for representing ontologies in the semantic web. The web ontology language owl 3 developed by the world wide web consortium w3c is the most. Owl would use the rdf meaning of classes and properties rdfs. Owl 5 the disadvantage of owl full is the language has become so powerful as to be undecidable, dashing any hope of complete let alone e cient reasoning support. Mcguinness and f van harmelen eds owl web ontology language overview.
Owl 2 web ontology language document overview second edition. This chapter describes concepts related to the support for a subset of the web ontology language owl. Chapter one of the tutorial introduces ontology web language owl to business and the beginning ontologist. Web ontology language owl world wide web consortium. The owl web ontology language, in which owl is to be construed as an acronym for web ontology language, is being designed by the w3c web ontology working group. The web ontology language owl is a semantic markup language for publishing and sharing ontologies on the world wide web. The owl file stores source code written in web ontology language. The web ontology language owl provides a sophisticated language for building complex domain ontologies and is widely used in bioontologies such as the gene ontology. Using owl building ontologies determine how the world domain should work. The owl file extension is associated with the web ontology language, a semantic web language designed to represent rich and complex knowledge about things, groups of things, and relations between things developed by w3c owl working group. Web ontology language ontologies in computer science are based on formal logic with wellfounded semantics. The example black rock manages emerging markets etf is a good introduction to fibo.
An ontology language is a formal language used to encode the ontology. This document is also available in these nonnormative formats. Semantic web technologies set of technologies and frameworks that enable such integration the web of data possible semantic annotation and retrieval. Owl ontologies can be used to describe the properties of web resources. Introduction to web ontology language owl trinity college dublin. Owl 10 is a new ontology language for the semantic web, developed by the world wide web consortium w3c web ontology working group. Owl s is an ontology built on top of web ontology language owl by the darpa daml program. A java interface and implementation for the w3c web ontology language owl, used to represent semantic web ontologies. For example, suppose several different web sites contain medical information or provide medical ecommerce services. Ontologies are a formal way to describe taxonomies and classification networks, essentially defining the structure of knowledge for various domains. The web ontology language owl is a language for defining ontologies on the web. Owl 2 ontologies can be used along with information written in rdf.
Owl 2 ontologies provide classes, properties, individuals, and data values and are stored as semantic web documents. The web ontology language owl the rapid evolution of semantic web ontology languages was enabled by learning from the experiences in developing existing knowledge representation formalisms and database conceptual models, and by inheriting and extending some of their useful features. Ebiquity research group semantic web reference card v2. Owl 2 ontologies can be used along with information written in rdf, and owl 2 ontologies. Owl was primarily designed to represent information about categories of objects and how objects are interrelatedthe sort of information that is often called an ontology. One of the main tools for this is owl, an ontology computer language.
Owl has more facilities for expressing meaning and semantics than xml, rdf, and rdfs, and thus owl goes beyond these languages in its ability to represent machine interpretable content on the web. This is especially important in regards to the web because it offers the hope of organizing the web by meanings, not just by matching strings of characters. Ocres modeling is independent of any specific study design or clinical domain. The last two lines declare the ontology namespace according to owl 2 requirements and specify a title for the ontology. Use of the web ontology language the web ontology language owl is a standard provided by the world wide web consortium w3c for representing ontologies and ontologyrelated information. An owl ontology describes a domain in terms of classes, properties and individuals and may include rich descriptions of the characteristics of those objects. Abstract the web ontology language owl is a semantic markup language for publishing and sharing ontologies on the world wide web. It will enable users and software agents to automatically discover, invoke, compose, and monitor web. The reference implementation of the owl api, written in java, includes validators for the various owl 2 pro. Owl, api, java, reasoning, application development 1. Citeseerx citation query owl web ontology language guide. In this chapter, we cover owl in great detail, and after finishing this chapter, you will be quite comfortable when it comes to defining ontologies using owl. Pdf owl web ontology languageoverview researchgate. As a key technical component in the world of the semantic web, the web ontology language owl is the most popular language to use when creating ontologies.
Pdf owl web ontology language reference researchgate. Owl web ontology language adelia gouveia and jorge cardoso. Pdf owl web ontology language reference ian horrocks. Web ontology language snomed ct glossary snomed confluence. The web ontology language owl is a family of knowledge representation languages for authoring ontologies. Owl is a computational logicbased language such that knowledge expressed in owl can be exploited by computer programs, e. The owl api has widespread usage in a variety of tools and applications. This page is organized into the following groupings. Owl has features from several families of representation languages, including primarily description logics and frames.
The w3c web ontology language owl is a semantic web language designed to represent rich and complex knowledge about things, groups of things, and relations between things. Please see owl 2 document overview for an introduction to owl 2. Rdf element reference other languages that our ontology model uses, including owl, rdf, rdfs, and xsd. This document is one component of the description of owl, the web ontology language, being produced by. Description logic is a sublanguage of owl full which restricts the. Citeseerx citation query owl web ontology language reference. If these web sites share and publish the same underlying ontology of the terms they all use, then computer agents can extract and aggregate information from these different sites. The language is typically a natural language image of a formal system, such as predicate logic in 4 or owl web ontology language 5 in 6. If your ontology is available in multiple formats, please feel free to link to it from multiple sections.
Getting started continues with stepbystep instructions for ontology editor, protege and query tools looking at legal ontology classes. Owl 2, is an ontology language for the semantic web with formally. Already in the first sentence of the owl recommendation it is stated that the owl web ontology language is designed for use by applications that need to process the content of information instead of just presenting information to humans 9. The intent is to provide a language that can be used for applications that need to understand content, instead of just humanreadable presentation of content, according to w3c. Entities are identified using uris to work in a web setting axioms. Owl 2 web ontology language document overview second. An ontology defines classes for the things that exist in the domain you are modeling. The final goal of the semantic web is a web in which machines can understand the content of the. Rdf is a general purpose language for representing information on the web, built on uri and xml technologies. It builds on the information in chapter 1, and it assumes that you are familiar with the major concepts associated with owl, such as ontologies, properties, and relationships. Owl also shares many characteristics with rdf, the w3c base of the semantic web. More recently, web ontology language owl 5 builds upon and provides greater. Apr 14, 2016 w3c recommendation, february 2004 web standard web ontology language built on top of rdf rdf. Information on how to open owl files from the protege owl editor is available on the main protege web site.
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