The Linking Open Data cloud diagram
Linked Data: Evolving the Web into a Global Data Space
Describing Copyright in RDF - Creative Commons Rights Expression Language
Watson Semantic Web Search
This is the Watson Web interface for searching ontologies and semantic documents using keywords. This interface is subject to frequent evolutions and improvements. If you want to share your opinion, suggest improvement or comment on the results, don't hesitate to contact us... At the moment, you can enter a set of keywords (e.g. "cat dog old_lady"), and obtain a list of URIs of semantic documents in which the keywords appear as identifiers or in literals of classes, properties, and individuals. Search options allow you to restrict the search space to particular types of entities (classes, properties or individuals) and to particular elements within the entities (local name, label, comment or any literal). Navigation in the results follows very simple principles. sign appears, it can be used to display additional information about the element it is attached with.
RDFa Primer
We begin the introduction to RDFa by using a subset of all the possibilities called RDFa Lite 1.1 [rdfa-lite]. The goal, when defining that subset, was to define a set of possibilities that can be applied to most simple to moderate structured data markup tasks, without burdening the authors with additional complexities. Many Web authors will not need to use more than this minimal subset. 2.1.1 The First Steps: Adding Machine-Readable Hints to Web Pages Consider Alice, a blogger who publishes a mix of professional and personal articles at We will construct markup examples to illustrate how Alice can use RDFa. 2.1.1.1 Hints on Social Networking Sites Alice publishes a blog and would like to provide extra structural information on her pages like the publication date or the title. Example 1 <html><head> ... This information is, however, aimed at humans only; computers need some sophisticated methods to extract it. Example 2 <html><head> ... Example 3 Example 4 Example 5
SWSE
RDFa, Drupal and a Practical Semantic Web
In the march toward creating the semantic web, web content management systems such as Drupal (news, site) and many proprietary vendors struggle with the goal of emitting structured information that other sites and tools can usefully consume. There's a balance to be struck between human and machine utility, not to mention simplicity of instrumentation. With RDFa (see W3C proposal), software and web developers have the specification they need to know how to structure data in order to lend meaning both to machines and to humans, all in a single file. And from what we've seen recently, the Drupal community is making the best of it. Introducing RDFa RDFa is a set of XHTML attributes meant in particular to augment visual data with machine-readable hints. Actually, RDFa goes beyond this, providing somewhat of a circular benefit. RDFa, RDF, XML and XHTML Okay, too many acronyms you say? RDFa is based upon the principles of RDF. The Heart of RDF RDF in Action <? RDFa is Much Simpler Than RDF
SweoIG/TaskForces/CommunityProjects/LinkingOpenData - ESW Wiki
News 2014-12-03: The 8th edition of the Linked Data on the Web workshop will take place at WWW2015 in Florence, Italy. The paper submission deadline for the workshop is 15 March, 2015. 2014-09-10: An updated version of the LOD Cloud diagram has been published. The new version contains 570 linked datasets which are connected by 2909 linksets. Project Description The Open Data Movement aims at making data freely available to everyone. The goal of the W3C SWEO Linking Open Data community project is to extend the Web with a data commons by publishing various open data sets as RDF on the Web and by setting RDF links between data items from different data sources. RDF links enable you to navigate from a data item within one data source to related data items within other sources using a Semantic Web browser. The figures below show the data sets that have been published and interlinked by the project so far. Clickable version of this diagram. Project Pages Meetings & Gatherings See Also Demos 1. 2.
Using Dublin Core - The Elements
NOTE: This text was last revised in 2005. As of 2011, a completely revised User Guide is being developed at the wiki page DCMI's Glossary and FAQ are also under revision. This section lists each element by its full name and label. In the element descriptions below, a formal single-word label is specified to make the syntactic specification of elements simpler for encoding schemes. Some information may appear to belong in more than one metadata element. 4.1. Label: Title Element Description: The name given to the resource. Guidelines for creation of content: If in doubt about what constitutes the title, repeat the Title element and include the variants in second and subsequent Title iterations. Examples: Title="A Pilot's Guide to Aircraft Insurance" Title="The Sound of Music" Title="Green on Greens" Title="AOPA's Tips on Buying Used Aircraft" 4.2. Label: Subject and Keywords Element Description: The topic of the content of the resource. 4.3.
Primer - Getting into the semantic web and RDF using N3
[translations into other languages ] The world of the semantic web, as based on RDF, is really simple at the base. This article shows you how to get started. It uses a simplified teaching language -- Notation 3 or N3 -- which is basically equivalent to RDF in its XML syntax, but easier to scribble when getting started. Subject, verb and object In RDF, information is simply a collection of statements, each with a subject, verb and object - and nothing else. <#pat><#knows><#jo> . Everything, be it subject, verb, or object, is identified with a Uniform Resource Identifier. There is one exception: the object (only) can be a literal, such as a string or integer: <#pat><#knows><#jo> . The verb "knows" is in RDF called a "property" and thought of as a noun expressing a relation between the two. <#pat><#child><#al> . alternatively, to make it more readable, as either <#pat> has <#child><#al> . or <#al> is <#child> of <#pat> . <#pat><#child><#al>, <#chaz>, <#mo> ; <#age> 24 ; <#eyecolor> "blue" . . . More
Open Archives Initiative - Protocol for Metadata Harvesting - v.2.0
Editors The OAI Executive:Carl Lagoze <lagoze@cs.cornell.edu > -- Cornell University - Computer Science Herbert Van de Sompel <herbertv@lanl.gov > -- Los Alamos National Laboratory - Research Library From the OAI Technical Committee:Michael Nelson <m.l.nelson@larc.nasa.gov > -- NASA - Langley Research Center Simeon Warner <simeon@cs.cornell.edu > -- Cornell University - Computer Science Table of Contents 1. Introduction2. The Open Archives Initiative Protocol for Metadata Harvesting (referred to as the OAI-PMH in the remainder of this document) provides an application-independent interoperability framework based on metadata harvesting. Data Providers administer systems that support the OAI-PMH as a means of exposing metadata; and Service Providers use metadata harvested via the OAI-PMH as a basis for building value-added services. This document refers in several places to "community-specific" practices to which individual protocol implementations may conform. 2.1 Harvester 2.2 Repository None
Linked Data | Linked Data - Connect Distributed Data across the Web
