rdf resource description framework wikipedia

[38][39] Likewise named graphs in which a set of triples is named by a URI can represent context without the need to reify the triples.[40]. In Semantic Web applications, and in relatively popular applications of RDF like RSS and FOAF (Friend of a Friend), resources tend to be represented by URIs that intentionally denote, and can be used to access, actual data on the World Wide Web. The RDF data model[2] is similar to classical conceptual modeling approaches (such as entity–relationship or class diagrams). Before, the common methodology was using keyword searching, but this method is problematic because it does not consider synonyms. Implementation of scopes does not necessarily require fully reified statements. Deze pagina is voor het laatst bewerkt op 18 okt 2018 om 08:02. If the software recognizes http://purl.org/dc/elements/1.1/title (a specific definition for the concept of a title established by the Dublin Core Metadata Initiative), it will also know that this title is different from a land title or an honorary title or just the letters t-i-t-l-e put together. D'autres syntaxes de RDF sont apparues ensuite, … “Dynamic, Localized Space Based Semantic Webs”. It is also used in knowledge management … To install click the Add extension button.

Développé par le W3C, RDF est le langage de base du Web sémantique. The first version[1][2] was published by the World-Wide Web Consortium (W3C) in April 1998, and the final[3] W3C recommendation was released in February 2014. SPARQL is an SQL-like language, and a recommendation of the W3C as of January 15, 2008. They are not directly identifiable from the RDF statement. Resource Description Framework of RDF is een standaard van het World Wide Web Consortium (W3C), oorspronkelijk ontworpen als een metadata-model, maar gaandeweg gebruikt als een formaat om gegevens in het algemeen voor te stellen en uit te wisselen. The body of knowledge modeled by a collection of statements may be subjected to reification, in which each statement (that is each triple subject-predicate-object altogether) is assigned a URI and treated as a resource about which additional statements can be made, as in "Jane says that John is the author of document X". However, RDF puts the information in a formal way that a machine can understand. When used as such a property is a predicate (see also RDF: reification).

RDFS constructs are the RDFS classes, associated properties and utility properties built on the limited vocabulary of RDF. This mechanism for describing resources is a major component in the W3C's Semantic Web activity: an evolutionary stage of the World Wide Web in which automated software can store, exchange, and use machine-readable information distributed throughout the Web, in turn enabling users to deal with the information with greater efficiency and certainty. The RDF 1.0 specification was published in 2004, the RDF 1.1 specification in 2014. This is why ontologies are useful in this situation. A collection of RDF statements intrinsically represents a labeled, directed multi-graph. But RDF, in general, is not limited to the description of Internet-based resources. Das Resource Description Framework (RDF, engl.

"Dr." (with a predicate "whose title is"). RQL, one of the first declarative languages for uniformly querying RDF schemas and resource descriptions, implemented in RDFSuite. Note that this is not a 'bare' resource identifier, but is rather a URI reference, containing the '#' character and ending with a fragment identifier. It is based on the idea of making statements about resources (in particular web resources) in expressions of the form subject–predicate–object, known as triples. RDF Model and Syntax: espone la struttura del modello RDF, e descrive una possibile sintassi.

Oliver Ian, Honkola Jukka, Ziegler Jurgen (2008). "whose title is" is http://www.w3.org/2000/10/swap/pim/contact#personalTitle. [4] An instance of foaf:Person is a resource that is linked to the class foaf:Person using the rdf:type property, such as in the following formal expression of the natural-language sentence: 'John is a Person'. Het onderliggende datamodel kent meerdere syntaxes, bijvoorbeeld RDF/XML, N3, Turtle, N-Triples, Trig, Trix.

You could also do it yourself at any point in time. This would imply that the best solution would incorporate both fuzzy logic and ontology.[57]. Mittlerweile gilt RDF als ein … The Resource Description Framework (RDF) is a family of World Wide Web Consortium (W3C) specifications originally designed as a metadata data model.It has come to be used as a general method for conceptual description or modeling of information that is implemented in web resources, using a variety of syntax notations and data serialization formats.

For example, the URI for each predicate: In addition, the subject has a type (with URI http://www.w3.org/1999/02/22-rdf-syntax-ns#type), which is person (with URI http://www.w3.org/2000/10/swap/pim/contact#Person). L'une des syntaxes (ou sérialisations) de ce langage est RDF/XML. Il Resource Description Framework (RDF) è lo strumento base proposto da W3C per la codifica, lo scambio e il riutilizzo di metadati strutturati e consente l'interoperabilità semantica tra applicazioni che condividono le informazioni sul Web. Borrowing from concepts available in logic (and as illustrated in graphical notations such as conceptual graphs and topic maps), some RDF model implementations acknowledge that it is sometimes useful to group statements according to different criteria, called situations, contexts, or scopes, as discussed in articles by RDF specification co-editor Graham Klyne.

De tekst is beschikbaar onder de licentie. "Eric Miller" (with a predicate "whose name is"), mailto:e.miller123(at)example (with a predicate "whose email address is"), and. Note that the URIs chosen here are not standard, and don't need to be, as long as their meaning is known to whatever is reading them. RDF geeft, samen met andere gereedschappen, betekenis aan de inhoud van webpagina's en al die gereedschappen zijn een deel van het semantisch-webproject van Tim Berners-Lee. This vocabulary is used as a foundation for RDF Schema, where it is extended. [36][37] For example, a statement can be associated with a context, named by a URI, in order to assert an "is true in" relationship. ), not only which entailment relation is used, but also which queries and graphs are well-formed for the regime. Het predicaat is welk kenmerk of aspect van die bron beschreven wordt.

RDF Schema (Resource Description Framework Schema, variously abbreviated as RDFS, RDF(S), RDF-S, or RDF/S) is a set of classes with certain properties using the RDF extensible knowledge representation data model, providing basic elements for the description of ontologies. Ursprünglich wurde RDF vom World Wide Web Consortium (W3C) als Standard zur Beschreibung von Metadaten konzipiert. For example, the following declares that 'Every Person is an Agent': foaf:Person rdfs:subClassOf foaf:Agent. The initial RDF design, intended to "build a vendor-neutral and operating system-independent system of metadata,"[4] derived from the W3C's Platform for Internet Content Selection (PICS), an early web content labelling system,[5] but the project was also shaped by ideas from Dublin Core, and from the Meta Content Framework (MCF),[4] which had been developed during 1995–1997 by Ramanathan V. Guha at Apple and Tim Bray at Netscape. The object could be a resource or literal element. De terminologie is ontleend aan de logica en taalkunde waar subject-predicaat of subject-predicaat-objectstructuren, gelijkwaardige maar toch verschillende betekenissen hebben. Several common serialization formats are in use, including: RDF/XML is sometimes misleadingly called simply RDF because it was introduced among the other W3C specifications defining RDF and it was historically the first W3C standard RDF serialization format. It is also used in knowledge management applications. The following is an example of a SPARQL query to show country capitals in Africa, using a fictional ontology: Other non-standard ways to query RDF graphs include: There are several proposals to validate and describe RDF: The following example is taken from the W3C website[46] describing a resource with statements "there is a Person identified by http://www.w3.org/People/EM/contact#me, whose name is Eric Miller, whose email address is e.miller123(at)example (changed for security purposes), and whose title is Dr.". An entailment regime defines, by using RDFS (or OWL, etc. For example, a URI that begins with "http:" and is used as the subject of an RDF statement does not necessarily have to represent a resource that is accessible via HTTP, nor does it need to represent a tangible, network-accessible resource — such a URI could represent absolutely anything. Hierarchies of classes support inheritance of a property domain and range (see definitions in the next section) from a class to its subclasses. Het subject is in essentie de resource die beschreven wordt. A typical example of an rdfs:Class is foaf:Person in the Friend of a Friend (FOAF) vocabulary. Such agreement is not inherent to RDF itself, although there are some controlled vocabularies in common use, such as Dublin Core Metadata, which is partially mapped to a URI space for use in RDF. Resources indicated by blank nodes are called anonymous resources. ; RDF Schema: espone la sintassi per … [17], This series was superseded in 2014 by the following six "RDF 1.1" documents: "RDF 1.1 Primer,"[18] "RDF 1.1 Concepts and Abstract Syntax,"[19] "RDF 1.1 XML Syntax,"[20] "RDF 1.1 Semantics,"[21] "RDF Schema 1.1,"[22] and "RDF 1.1 Test Cases". The purpose of RDF is to provide an encoding and interpretation mechanism so that resources can be described in a way that particular software can understand it; in other words, so that software can access and use information that it otherwise couldn't use. In a like manner, given that "http://en.wikipedia.org/wiki/Tony_Benn" identifies a particular resource (regardless of whether that URI could be traversed as a hyperlink, or whether the resource is actually the Wikipedia article about Tony Benn), to say that the title of this resource is "Tony Benn" and its publisher is "Wikipedia" would be two assertions that could be expressed as valid RDF statements.

The Resource Description Framework (RDF) is a family of World Wide Web Consortium (W3C) specifications[1] originally designed as a metadata data model. Although the RDF/XML format is still in use, other RDF serializations are now preferred by many RDF users, both because they are more human-friendly,[34] and because some RDF graphs are not representable in RDF/XML due to restrictions on the syntax of XML QNames. This is because values that are useful when describing roads, like slipperiness, are not precise concepts and cannot be measured. Basic RDF triple comprising (subject, predicate, object). RDF saw little take-up in this period, but there was significant work done in Bristol, around ILRT at Bristol University and HP Labs, and in Boston at MIT. RDF (Resource Description Framework) je World Wide Web Consortium (W3C) špecifikácia formátu, podporujúca popis zdrojov pomocou abstraktného modelu metadát, implementovaná v jazyku XML.Myšlienkou modelu RDF metadát je posunúť web bližšie k sémantickému webu a pridať tak do webových stránok štruktúru a pre počítače zrozumiteľný význam (sémantiku). Microsoft shipped a product, Connected Services Framework. Reification is sometimes important in order to deduce a level of confidence or degree of usefulness for each statement.

The other classes described by the RDF and RDFS specifications are: Properties are instances of the class rdf:Property and describe a relation between subject resources and object resources. RDF is being used to have a better understanding of road traffic patterns. The resource "http://www.w3.org/People/EM/contact#me" is the subject. In the N-Triples form of RDF, these statements might look like the following: To an English-speaking person, the same information could be represented simply as: The title of this resource, which is published by Wikipedia, is 'Tony Benn'. However, it is important to distinguish the RDF/XML format from the abstract RDF model itself.

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