AllegroGraph RDFStore Web 3.0's Database. Geospatial and Temporal Reasoning AllegroGraph stores geospatial and temporal data types as native data structures. Combined with its indexing and range query mechanisms, AllegroGraph lets you perform geospatial and temporal reasoning efficiently. Social Networking Analysis AllegroGraph includes an SNA library that treats a triple-store as a graph of relations, with functions for measuring importance and centrality as well as several families of search functions. Example algorithms are nodal-degree, nodal-neighbors, ego-group, graph-density, actor-degree-centrality, group-degree-centrality, actor-closeness-centrality, group-closeness-centrality, actor betweenness-centrality, group-betweenness-centrality, page-rank-centrality, and cliques. Geospatial and temporal primitives combined with SNA functions form an Activity Recognition framework for flexibly analyzing networks and events in large volumes of structured and unstructured data.
Semantic_web. RDF - Semantic Web Standards. Overview RDF is a standard model for data interchange on the Web. RDF has features that facilitate data merging even if the underlying schemas differ, and it specifically supports the evolution of schemas over time without requiring all the data consumers to be changed. RDF extends the linking structure of the Web to use URIs to name the relationship between things as well as the two ends of the link (this is usually referred to as a “triple”). Using this simple model, it allows structured and semi-structured data to be mixed, exposed, and shared across different applications. This linking structure forms a directed, labeled graph, where the edges represent the named link between two resources, represented by the graph nodes. This graph view is the easiest possible mental model for RDF and is often used in easy-to-understand visual explanations. Recommended Reading The RDF 1.1 specification consists of a suite of W3C Recommendations and Working Group Notes, published in 2014.
Lod-datasets_2010-09-22. User Guide for Sesame 2.3. Mark-watson/java_practical_semantic_web - GitHub. Mark Watson, Ruby and Java Consultant and Author. SPARQL Query Language for RDF. W3C Recommendation 15 January 2008 New Version Available: SPARQL 1.1 (Document Status Update, 26 March 2013) The SPARQL Working Group has produced a W3C Recommendation for a new version of SPARQL which adds features to this 2008 version. Please see SPARQL 1.1 Overview for an introduction to SPARQL 1.1 and a guide to the SPARQL 1.1 document set.
This version: Latest version: Previous version: Editors: Eric Prud'hommeaux, W3C <eric@w3.org> Andy Seaborne, Hewlett-Packard Laboratories, Bristol <andy.seaborne@hp.com> Please refer to the errata for this document, which may include some normative corrections. See also translations. Copyright © 2006-2007 W3C® (MIT, ERCIM, Keio), All Rights Reserved. Abstract RDF is a directed, labeled graph data format for representing information in the Web.
Status of This Document This is a W3C Recommendation. Appendices ? ? ? ? Semantic Web. The promise of web standards W3C standards define an open web platform for application development. The web has the unprecedented potential to enable developers to build rich interactive experiences, that can be available on any device.
The platform continues to expand, but web users have long ago rallied around HTML as the cornerstone of the web. Many more technologies that W3C and its partners are creating extend the web and give it full strength, including CSS, SVG, WOFF, WebRTC, XML, and a growing variety of APIs. Read more about W3C Standards Why W3C web standards? W3C publishes recommendations, that are considered web standards. W3C develops technical specifications according to the W3C Process, which is designed to maximize consensus, ensure quality, earn endorsement and adoption by W3C Members and the broader community. W3C web standards are optimized for interoperability, security, privacy, web accessibility, and internationalization. Value of creating standards at W3C. Virtuoso Facets Web Service. What The Virtuoso Facets web service is a general purpose RDF query facility for facet based browsing.
It takes an XML description of the desired view, and generates the reply as an XML tree containing the requested data. The user agent or a local web page can use XSLT for rendering this for the end user. Why The selection of facets and values is represented as an XML tree. Such a representation is easier to process in an application than the SPARQL source text or a parse tree of SPARQL, and more compactly captures the specific subset of SPARQL needed for faceted browsing. The Web service also returns the SPARQL source text, which can serve as a basis for hand-crafted queries. How The top element of the tree is <query>. The <query> element has the following attributes: The result is a tree of the form: <facets xmlns=" datatype="... " shortform="... " xml:lang=" The first column's text child is the text form of the value.
Customizing. Mediawiki-database-schema.png (PNG Image, 2958x1477 pixels) - Scaled (37.