This link has been bookmarked by 106 people . It was first bookmarked on 24 Apr 2006, by Alex Choi.
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every URI that is used as a class name must be explicitly asserted to be of type owl:Class (and similarly for properties), every individual must be asserted to belong to at least one class (even if only owl:Thing), the URI's used for classes, properties and individuals must be mutually disjoint
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OWL DL supports those users who want the maximum expressiveness while retaining computational completeness (all conclusions are guaranteed to be computable) and decidability (all computations will finish in finite time). OWL DL includes all OWL language constructs, but they can be used only under certain restrictions (for example, while a class may be a subclass of many classes, a class cannot be an instance of another class). <!-- FvH: DELETED because too technical with restrictions such as type separation (a class can not also be an individual or property, a property can not also be an individual or class). -->OWL DL is so named due to its correspondence with description logics, a field of research that has studied the logics that form the formal foundation of OWL.
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OWL can be used to explicitly represent the meaning of terms in vocabularies and the relationships between those terms.
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This representation of terms and their interrelationships is called an ontology.
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the content of information instead of just presenting information to humans
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Allard StrijkerThe 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. OWL facilitates greater machine interpretability of Web content than that supported by XML,
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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.
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johannes kannesOWL Web Ontology Language
Overview
W3C Recommendation 10 February 2004 -
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OWL has three increasingly-expressive sublanguages: OWL Lite, OWL DL, and OWL Full.
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This representation of terms and their interrelationships is called an ontology.
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The Semantic Web will build on XML's ability to define customized tagging schemes and RDF's flexible approach to representing data.
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among others, relations between classes (e.g. disjointness), cardinality (e.g. "exactly one"), equality, richer typing of properties, characteristics of properties (e.g. symmetry), and enumerated classes.
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OWL Lite supports those users primarily needing a classification hierarchy and simple constraints.
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OWL DL supports those users who want the maximum expressiveness while retaining computational completeness (all conclusions are guaranteed to be computable) and decidability (all computations will finish in finite time).
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OWL Lite uses only some of the OWL language features and has more limitations on the use of the features than OWL DL or OWL Full. For example, in OWL Lite classes can only be defined in terms of named superclasses (superclasses cannot be arbitrary expressions), and only certain kinds of class restrictions can be used. Equivalence between classes and subclass relationships between classes are also only allowed between named classes, and not between arbitrary class expressions. Similarly, restrictions in OWL Lite use only named classes. OWL Lite also has a limited notion of cardinality - the only cardinalities allowed to be explicitly stated are 0 or 1.
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Class: A class defines a group of individuals that belong together because they share some properties.
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built-in most general class
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rdfs:subClassOf: Class hierarchies may be created by making one or more statements that a class is a subclass of another class.
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rdf:Property: Properties can be used to state relationships between individuals or from individuals to data values.
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Both owl:ObjectProperty and owl:DatatypeProperty are subclasses of the RDF class rdf:Property.
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rdfs:subPropertyOf: Property hierarchies may be created by making one or more statements that a property is a subproperty of one or more other properties.
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rdfs:domain: A domain of a property limits the individuals to which the property can be applied.
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rdfs:range: The range of a property limits the individuals that the property may have as its value.
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Individual : Individuals are instances of classes, and properties may be used to relate one individual to another.
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equivalentClass : Two classes may be stated to be equivalent.
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equivalentProperty: Two properties may be stated to be equivalent.
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sameAs: Two individuals may be stated to be the same.
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differentFrom: An individual may be stated to be different from other individuals.
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AllDifferent: A number of individuals may be stated to be mutually distinct in one AllDifferent statement.
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inverseOf: One property may be stated to be the inverse of another property.
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TransitiveProperty: Properties may be stated to be transitive.
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SymmetricProperty: Properties may be stated to be symmetric.
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FunctionalProperty : Properties may be stated to have a unique value.
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InverseFunctionalProperty: Properties may be stated to be inverse functional.
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allValuesFrom: The restriction allValuesFrom is stated on a property with respect to a class. It means that this property on this particular class has a local range restriction associated with it.
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someValuesFrom: The restriction someValuesFrom is stated on a property with respect to a class. A particular class may have a restriction on a property that at least one value for that property is of a certain type.
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minCardinality: Cardinality is stated on a property with respect to a particular class.
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maxCardinality: Cardinality is stated on a property with respect to a particular class.
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cardinality: Cardinality is provided as a convenience when it is useful to state that a property on a class has both minCardinality 0 and maxCardinality 0 or both minCardinality 1 and maxCardinality 1.
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intersectionOf: OWL Lite allows intersections of named classes and restrictions.
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oneOf: (enumerated classes): Classes can be described by enumeration of the individuals that make up the class. The members of the class are exactly the set of enumerated individuals; no more, no less.
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hasValue: (property values): A property can be required to have a certain individual as a value (also sometimes referred to as property values).
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disjointWith: Classes may be stated to be disjoint from each other.
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unionOf, complementOf, intersectionOf (Boolean combinations): OWL DL and OWL Full allow arbitrary Boolean combinations of classes and restrictions: unionOf, complementOf, and intersectionOf.
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minCardinality, maxCardinality, cardinality (full cardinality): While in OWL Lite, cardinalities are restricted to at least, at most or exactly 1 or 0, full OWL allows cardinality statements for arbitrary non-negative integers.
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complex classes : In many constructs, OWL Lite restricts the syntax to single class names (e.g. in subClassOf or equivalentClass statements). OWL Full extends this restriction to allow arbitrarily complex class descriptions, consisting of enumerated classes, property restrictions, and Boolean combinations. Also, OWL Full allows classes to be used as instances (and OWL DL and OWL Lite do not).
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This document provides an overview of the Web Ontology Language by providing a brief introduction to why one might need a Web ontology language and how OWL fits in with related W3C languages. It also provides a brief description of the three OWL sublanguages: OWL Lite, OWL DL, and OWL Full along with a feature synopsis for each of the languages.
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03 Sep 08
cezarmThis document is written for readers who want a first impression of the capabilities of OWL. It provides an introduction to OWL by informally describing the features of each of the sublanguages of OWL.
xml web2.0 web w3c technology tagging standards owl ontology semanticweb rdf standard semantic viaDelicious
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27 Aug 08
scmoralThe 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. OWL facilitates greater machine interpretability of Web content than that supported by XML,
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Amiga JonesW3C.org. (2004). "OWL Web Ontology Language Overview." from http://www.w3.org/TR/owl-features/
OWL is intended to be used when the information contained in documents needs to be processed by applications-
OWL is intended to be used when the information contained in documents needs to be processed by applications
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OWL can be used to explicitly represent the meaning of terms in vocabularies and the relationships between those terms.
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as opposed to situations where the content only needs to be presented to humans.
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This representation of terms and their interrelationships is called an ontology
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The Semantic Web is a vision for the future of the Web in which information is given explicit meaning, making it easier for machines to automatically process and integrate information available on the Web
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The Semantic Web will build on XML's ability to define customized tagging schemes and RDF's flexible approach to representing data.
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The first level above RDF required for the Semantic Web is an ontology language what can formally describe the meaning of terminology used in Web documents.
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OWL has been designed to meet this need for a Web Ontology Language
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a surface syntax for structured documents
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XML provides
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XML Schema is a language for restricting the structure of XML documents and also extends XML with datatypes
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RDF is a datamodel for objects ("resources") and relations between them
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RDF Schema is a vocabulary for describing properties and classes of RDF resources
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OWL Lite supports those users primarily needing a classification hierarchy and simple constraints.
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OWL DL supports those users who want the maximum expressiveness while retaining computational completeness
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OWL Full is meant for users who want maximum expressiveness and the syntactic freedom of RDF with no computational guarantees.
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11 Jun 08
Xavier BadosaThe 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. OWL facilitates greater machine interpretability of Web content than that supported by XML,
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OWL has three increasingly-expressive sublanguages: OWL Lite, OWL DL, and OWL Full.
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Roman grup AlgosThe 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. OWL facilitates greater machine interpretability of Web content than that supported by XML,
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sublanguages
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Fabien GandonThe 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. OWL facilitates greater machine interpretability of Web content than that supported by XML,
Recommendation KnowledgeRepresentation metadata ontologies ontology OWL OwlLite rdf RDFS Reference semantic semantic_web semweb standards W3C web semanticWeb standard
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Gary BurgeThe 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. OWL facilitates greater machine interpretability of Web content than that supported by XML,
OWL ontology RDF w3c metadata reference standards SemanticWeb tagging
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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. OWL facilitates greater machine interpretability of Web content than that supported by XML, RDF, and RDF Schema (RDF-S) by providing additional vocabulary along with a formal semantics. OWL has three increasingly-expressive sublanguages: OWL Lite, OWL DL, and OWL Full.
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