This link has been bookmarked by 171 people . It was first bookmarked on 26 Feb 2008, by Perry Branch.
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Linked Data browsers
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Compared to these APIs, Linked Data has the advantage of providing a single, standardized access mechanism instead of relying on diverse interfaces and result formats
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Ed FreakAnleitung zur Veröffentlichung von Linked Data. Beschreibt auch im Detail, was Linked Data ist
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- use the RDF data model to publish structured data on the Web
- use RDF links to interlink data from different data sources
The term Linked Data was coined by Tim Berners-Lee in his Linked Data Web architecture note. The term refers to a style of publishing and interlinking structured data on the Web. The basic assumption behind Linked Data is that the value and usefulness of data increases the more it is interlinked with other data. In summary, Linked Data is simply about using the Web to create typed links between data from different sources.
The basic tenets of Linked Data are to:
Applying both principles leads to the creation of a data commons on the Web, a space where people and organizations can post and consume data about anything. This data commons is often called the Web of Data or Semantic Web.
The Web of Data can be accessed using Linked Data browsers, just as the traditional Web of documents is accessed using HTML browsers. However, instead of following links between HTML pages, Linked Data browsers enable users to navigate between different data sources by following RDF links. This allows the user to start with one data source and then move through a potentially endless Web of data sources connected by RDF links. For instance, while looking at data about a person from one source, a user might be interested in information about the person's home town. By following an RDF link, the user can navigate to information about that town contained in another dataset.
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- more easily crawled by search engines,
- accessed using generic data browsers, and
- enables links between data from different data sources.
Just as the traditional document Web can be crawled by following hypertext links, the Web of Data can be crawled by following RDF links. Working on the crawled data, search engines can provide sophisticated query capabilities, similar to those provided by conventional relational databases. Because the query results themselves are structured data, not just links to HTML pages, they can be immediately processed, thus enabling a new class of applications based on the Web of Data.
The glue that holds together the traditional document Web is the hypertext links between HTML pages. The glue of the data web is RDF links. An RDF link simply states that one piece of data has some kind of relationship to another piece of data. These relationships can have different types. For instance, an RDF link that connects data about people can state that two people know each other; an RDF link that connects information about a person with information about publications in a bibliographic database might state that a person is the author of a specific paper.
There is already a lot of structured data accessible on the Web through Web 2.0 APIs such as the eBay, Amazon, Yahoo, and Google Base APIs. Compared to these APIs, Linked Data has the advantage of providing a single, standardized access mechanism instead of relying on diverse interfaces and result formats. This allows data sources to be:
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To publish data on the Web, we first have to identify the items of interest in our domain. They are the things whose properties and relationships we want to describe in the data. In Web Architecture terminology, all items of interest are called resources
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When publishing Linked Data on the Web, we represent information about resources using the Resource Description Framework (RDF). RDF provides a data model that is extremely simple on the one hand but strictly tailored towards Web architecture on the other hand.
In RDF, a description of a resource is represented as a number of triples. The three parts of each triple are called its subject, predicate, and object. A triple mirrors the basic structure of a simple sentence, such as this one:
Chris has the email address chris@bizer.de . (subject) (predicate) (object)
The subject of a triple is the URI identifying the described resource. The object can either be a simple literal value, like a string, number, or date; or the URI of another resource that is somehow related to the subject. The predicate, in the middle, indicates what kind of relation exists between subject and object, e.g. this is the name or date of birth (in the case of a literal), or the employer or someone the person knows (in the case of another resource). The predicate is a URI too. These predicate URIs come from vocabularies, collections of URIs that can be used to represent information about a certain domain.
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It is common practice to use the owl:sameAs property for stating that another data source also provides information about a specific non-information resource. An owl:sameAs link indicates that two URI references actually refer to the same thing. Therefore, owl:sameAs is used to map between different URI aliases (see Section 2.1). Examples of using owl:sameAs to indicate that two URIs talk about the same thing are again Tim's FOAF profile which states that http://www.w3.org/People/Berners-Lee/card#i identifies the same resource as http://www4.wiwiss.fu-berlin.de/bookmashup/persons/Tim+Berners-Lee and http://www4.wiwiss.fu-berlin.de/dblp/resource/person/100007
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Lambert HellerLinkeddata.org points to this as definitive guide on best practices: http://www4.wiwiss.fu-berlin.de/bizer/pub/LinkedDataTutorial/ #ldow2011
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28 Jan 11
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13 Dec 10
Peter Jacobson"This document provides a tutorial on how to publish Linked Data on the Web. After a general overview of the concept of Linked Data, we describe several practical recipes for publishing information as Linked Data on the Web."
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D BRT @Stf_: Leichte und übersichtliche (technische) Einführung in
Semantic Web, RDF etc. http://bit.ly/d8MYjE - Dank an @cutuchiqueno
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24 Aug 10
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20 Jul 10
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The goal of Linked Data is to enable people to share structured data
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- use the RDF data model to publish structured data on the Web
- use RDF links to interlink data from different data sources
The basic tenets of Linked Data are to:
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This allows the user to start with one data source and then move through a potentially endless Web of data sources connected by RDF links
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the Web of Data can be crawled by following RDF links
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sophisticated query capabilities
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search engines
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The glue that holds together the traditional document Web is the hypertext links between HTML pages. The glue of the data web is RDF links.
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An RDF link simply states that one piece of data has some kind of relationship to another piece of data
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enables links between data from different data sources
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The subject of a triple is the URI identifying the described resource
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06 Jul 10
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04 Jul 10
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22 Jun 10
Yeray DariasThis document provides a tutorial on how to publish Linked Data on the Web. After a general overview of the concept of Linked Data, we describe several practical recipes for publishing information as Linked Data on the Web.
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21 Jun 10
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27 Apr 10
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11 Apr 10
Ben GodfreyPublishing linked open data how to from Chris Bizer and Richard Cyganiak of DBpedia and Tom Heath of Talis.
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09 Apr 10
Wheaton CollegeCould linked data be an output target? (e.g. I have a list of people in TEI and want to publish it as linked data ...)
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29 Mar 10
Christian HauschkeThis document provides a tutorial on how to publish Linked Data on the Web. After a general overview of the concept of Linked Data, we describe several practical recipes for publishing information as Linked Data on the Web.
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26 Mar 10
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24 Mar 10
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20 Mar 10
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instead of following links between HTML pages, Linked Data browsers enable users to navigate between different data sources by following RDF links. This allows the user to start with one data source and then move through a potentially endless Web of data sources connected by RDF links. For instance, while looking at data about a person from one source, a user might be interested in information about the person's home town. By following an RDF link, the user can navigate to information about that town contained in another dataset.
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For instance, an RDF link that connects data about people can state that two people know each other; an RDF link that connects information about a person with information about publications in a bibliographic database might state that a person is the author of a specific paper.
-
- more easily crawled by search engines,
- accessed using generic data browsers, and
- enables links between data from different data sources.
Compared to these APIs, Linked Data has the advantage of providing a single, standardized access mechanism instead of relying on diverse interfaces and result formats. This allows data sources to be:
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All the resources we find on the traditional document Web, such as documents, images, and other media files, are information resources. But many of the things we want to share data about are not: People, physical products, places, proteins, scientific concepts, and so on. As a rule of thumb, all “real-world objects” that exist outside of the Web are non-information resources.
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Resources are identified using Uniform Resource Identifiers (URIs). In the context of Linked Data, we restrict ourselves to using HTTP URIs only and avoid other URI schemes such as URNs and DOIs.
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Information resources can have representations. A representation is a stream of bytes in a certain format, such as HTML, RDF/XML, or JPEG.
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URI Dereferencing is the process of looking up a URI on the Web in order to get information about the referenced resource.
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Non-Information Resources cannot be dereferenced directly. Therefore Web architecture uses a trick to enable URIs identifying non-information resources to be dereferenced: Instead of sending a representation of the resource, the server sends the client the URI of a information resource which describes the non-information resource using the HTTP response code
303 See Other. This is called a 303 redirect. In a second step, the client dereferences this new URI and gets a representation describing the original non-information resource. -
The picture below shows how dereferencing a HTTP URI identifying a non-information resource plays together with content negotiation
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In an open environment like the Web it often happens that different information providers talk about the same non-information resource,
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As both URIs refer to the same non-information resource, they are called URI aliases.
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URI aliases provide an important social function to the Web of Data as they are dereferenced to different descriptions of the same non-information resource and thus allow different views and opinions to be expressed. In order to still be able to track that different information providers speak about the same non-information resource, it is common practice that information providers set owl:sameAs links to URI aliases they know about.
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term is associated description and it refers to the description of a non-information resource that a client obtains by dereferencing a specific URI identifying this non-information resource. For example: Deferencing the URI http://dbpedia.org/resource/Berlin asking for
application/rdf+xmlgives you, after a redirect, an associated description that is equal to the RDF description of http://dbpedia.org/resource/Berlin within the information resource http://dbpedia.org/data/Berlin. -
The three parts of each triple are called its subject, predicate, and object.
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Discovering Linked Data on the Web
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19 Feb 10
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09 Feb 10
Bill AndersonAbstract: This document provides a tutorial on how to publish Linked Data on the Web. After a general overview of the concept of Linked Data, we describe several practical recipes for publishing information as Linked Data on the Web. [Looks good. Recipes. Is it a cookbook?]
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23 Jan 10
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27 Dec 09
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17 Dec 09
johannes kannesThis document provides a tutorial on how to publish Linked Data on the Web. After a general overview of the concept of Linked Data, we describe several practical recipes for publishing information as Linked Data on the Web.
semanticweb rdf linkeddata tutorial metadata berlin _type:tutorial howto _seminar:wp13_semantic-retrieval _seminar:wp15-automatische-inhaltserschließung delicious-import
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- Friend-of-a-Friend (FOAF), vocabulary for describing people.
- Dublin Core (DC) defines general metadata attributes. See also their new domains and ranges draft.
- Semantically-Interlinked Online Communities (SIOC), vocabulary for representing online communities.
- Description of a Project (DOAP), vocabulary for describing projects.
- Simple Knowledge Organization System (SKOS), vocabulary for representing taxonomies and loosely structured knowledge.
- Music Ontology provides terms for describing artists, albums and tracks.
- Review Vocabulary, vocabulary for representing reviews.
- Creative Commons (CC), vocabulary for describing license terms.
- The URIs are dereferenceable, meaning that a description of the concept can be retrieved from the Web. For instance, using the DBpedia URI http://dbpedia.org/page/Doom to identify the computer game Doom gives you an extensive description of the game including abstracts in 10 different languages and various classifications.
- The URIs are already linked to URIs from other data sources. For instance, you can navigate from the DBpedia URI http://dbpedia.org/resource/Berlin to data about Berlin provided by Geonames and EuroStat. Therefore, by using concept URIs form these datasets, you interlink your data with a rich and fast-growing network of other data sources.
4.1 Reusing existing terms
A set of well-known vocabularies has evolved in the Semantic Web community. Please check whether your data can be represented using terms from these vocabularies before defining any new terms:
A more extensive list of well-known vocabularies is maintained by the W3C SWEO Linking Open Data community project in the ESW Wiki. A listing of the 100 most common RDF namespaces (August 2006) is provided by UMBC eBiquity Group.
It is common practice to mix terms from different vocabularies. We especially recommend the use of rdfs:label and foaf:depiction properties whenever possible as these terms are well-supported by client applications.
If you need URI references for geographic places, research areas, general topics, artists, books or CDs, you should consider using URIs from data sources within the W3C SWEO Linking Open Data community project, for instance Geonames, DBpedia, Musicbrainz, dbtune or the RDF Book Mashup. The two main benefits of using URIs from these data sources are:
A more extensive list of datasets with dereferenceable URIs is maintained by the Linking Open Data community project in the ESW Wiki.
Good examples of how terms from different well-known vocabularies are mixed in one document and how existing concept URIs are reused are given by the FOAF profiles of Tim Berners-Lee and Ivan Herman.
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cezarmThis document provides a tutorial on how to publish Linked Data on the Web. After a general overview of the concept of Linked Data, we describe several practical recipes for publishing information as Linked Data on the Web.
semanticweb rdf tutorial metadata data web semantic howto linkeddata viaDelicious
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30 Jun 09
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How to publish Linked Data on the Web
semanticweb rdf linkeddata tutorial metadata data web semantic
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22 Jun 09
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11 Jun 09
cazam 77This document provides a tutorial on how to publish Linked Data on the Web. After a general overview of the concept of Linked Data, we describe several practical recipes for publishing information as Linked Data on the Web.
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08 Jun 09
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The basic assumption behind Linked Data is that the value and usefulness of data increases the more it is interlinked with other data
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This data commons is often called the Web of Data or Semantic Web
-
- Friend-of-a-Friend (FOAF), vocabulary for describing people.
- Dublin Core (DC) defines general metadata attributes. See also their new domains and ranges draft.
- Semantically-Interlinked Online Communities (SIOC), vocabulary for representing online communities.
- Description of a Project (DOAP), vocabulary for describing projects.
- Simple Knowledge Organization System (SKOS), vocabulary for representing taxonomies and loosely structured knowledge.
- Music Ontology provides terms for describing artists, albums and tracks.
- Review Vocabulary, vocabulary for representing reviews.
- Creative Commons (CC), vocabulary for describing license terms.
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05 Jun 09
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04 Jun 09
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02 Jun 09
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12 May 09
Clemens RadlThis document provides a tutorial on how to publish Linked Data on the Web. After a general overview of the concept of Linked Data, we describe several practical recipes for publishing information as Linked Data on the Web.
tutorial howto reference metadata semanticweb rdf design architecture
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11 May 09
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24 Apr 09
tompasley"Abstract
This document provides a tutorial on how to publish Linked Data on the Web. After a general overview of the concept of Linked Data, we describe several practical recipes for publishing information as Linked Data on the Web."web semanticweb semantic metadata rdf tutorial data linked_data linkeddata to_read
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15 Apr 09
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16 Mar 09
René AudetSemantic Web, Tim Berners-Lee
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03 Mar 09
Stian DanenbargerThis document provides a tutorial on how to publish Linked Data on the Web. After a general overview of the concept of Linked Data, we describe several practical recipes for publishing information as Linked Data on the Web.
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27 Feb 09
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m mThis document provides a tutorial on how to publish Linked Data on the Web. After a general overview of the concept of Linked Data, we describe several practical recipes for publishing information as Linked Data on the Web.
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17 Dec 08
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28 Nov 08
murraywThis document provides a tutorial on how to publish Linked Data on the Web. After a general overview of the concept of Linked Data, we describe several practical recipes for publishing information as Linked Data on the Web
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20 Nov 08
Eugenio VaccaThe term Linked Data was coined by Tim Berners-Lee in his Linked Data Web architecture note. The term refers to a style of publishing and interlinking structured data on the Web. The basic assumption behind Linked Data is that the value and usefulness of
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