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Mulgara (software)
Mulgara is a triplestore and fork of the original Kowari project. It is open-source, scalable, and transaction-safe. Mulgara instances can be queried via the iTQL query language and the SPARQL query language. History Kowari was first made available for download in beta form on October 26, 2003. In April 2004, Tucana Technologies Inc demonstrated the Tucana Knowledge Server (TKS), a proprietary RDF database relying on Kowari as the basis. A steady number of releases occurred throughout 2004, includinan1.1 pre-release The development of TKS stalled due to difficulties with funding at the end of 2004, while the development of Kowari continued on. In September 2005, Tucana was bought by Northrop Grumman. In January 2006, Northrop Grumman threatened a Kowari developer with legal action if he released any new version of Kowari. As a consequence, Kowari was forked in July 2006. It was renamed to Mulgara as Northrop Grumman owned the Kowari trademark. All development on Kowari has stop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Java (programming Language)
Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It is a general-purpose programming language intended to let programmers ''write once, run anywhere'' ( WORA), meaning that compiled Java code can run on all platforms that support Java without the need to recompile. Java applications are typically compiled to bytecode that can run on any Java virtual machine (JVM) regardless of the underlying computer architecture. The syntax of Java is similar to C and C++, but has fewer low-level facilities than either of them. The Java runtime provides dynamic capabilities (such as reflection and runtime code modification) that are typically not available in traditional compiled languages. , Java was one of the most popular programming languages in use according to GitHub, particularly for client–server web applications, with a reported 9 million developers. Java was originally developed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Java Transaction API
The Jakarta Transactions (JTA; formerly Java Transaction API), one of the Jakarta EE APIs, enables distributed transactions to be done across multiple X/Open XA resources in a Java environment. JTA was a specification developed under the Java Community Process as JSR 907. JTA provides for: *demarcation of transaction boundaries *X/Open XA API allowing resources to participate in transactions. X/Open XA architecture In the X/Open XA architecture, a transaction manager or transaction processing monitor (TP monitor) coordinates the transactions across multiple resources such as databases and message queues. Each resource has its own resource manager. The resource manager typically has its own API for manipulating the resource, for example the JDBC API to work with relational databases. In addition, the resource manager allows a TP monitor to coordinate a distributed transaction between its own and other resource managers. Finally, there is the application which communicates with the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triplestores
A triplestore or RDF store is a purpose-built database for the storage and retrieval of triples through semantic queries. A triple is a data entity composed of subject–predicate–object, like "Bob is 35" or "Bob knows Fred". Much like a relational database, information in a triplestore is stored and retrieved via a query language. Unlike a relational database, a triplestore is optimized for the storage and retrieval of triples. In addition to queries, triples can usually be imported and exported using Resource Description Framework (RDF) and other formats. Implementations Some triplestores have been built as database engines from scratch, while others have been built on top of existing commercial relational database engines (such as SQL-based) or NoSQL document-oriented database engines. Like the early development of online analytical processing (OLAP) databases, this intermediate approach allowed large and powerful database engines to be constructed for little programming ef ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blazegraph
Blazegraph is an open source triplestore and graph database, developed by Systap, which is used in the Wikidata SPARQL endpoint and by other large customers. It is licensed under the GNU GPL (version 2). Amazon acquired the Blazegraph developers and the Blazegraph open source development was essentially stopped in April 2018. Early history The system was first known as ''Bigdata.'' Since release of version 1.5 (12 February 2015), it is named ''Blazegraph''. Prominent users * The Wikimedia Foundation uses Blazegraph for the Wikidatabr>Query Service which is a SPARQL endpoint. * ThDatatourismeproject uses Blazegraph as the database platform; however, GraphQL is used as the query language instead of SPARQL. Notable features * ''RDF*'' — an alternative approach to RDF reification, which gives RDF graphs capabilities of graphs; * as the consequence of the previous, ability of querying graphs both in SPARQL and Gremlin; * as an alternative to Gremlin querying, abstrac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CubicWeb
CubicWeb is a free and open-source semantic web application framework, licensed under the LGPL. It is written in Python. It has been an open free software project since October 2008, but the project began in 2000 and was initially developed by Logilab for internal uses such as intranet, bug tracker and forge applications. As of 2012, CubicWeb is being used in large-scale semantic web and linked open data applications and international corporations. Concepts The framework is entirely driven by a data model. Once the data model is defined, one gets a functional web application and can further customize the views (by default it provides a set of default views for each type of data). A cube is a reusable component defining specific features. For example, a cubforgeallows one to create one's own forge and the forge cube reuses the cubes comment, file, email, etc. Interesting general purpose cubes include dbpedia and openlibrary. The framework has been translated to English, Fren ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RDF4J
Eclipse RDF4J (formerly OpenRDF Sesame) is an open-source framework for storing, querying, and analysing RDF data. It was created by the Dutch software company Aduna as part of "On-To-Knowledge", a semantic web project that ran from 1999 to 2002. It contains implementations of an in-memory triplestore and an on-disk triplestore, along with two separate Servlet packages that can be used to manage and provide access to these triplestores, on a permanent server. The RDF4J Rio (RDF Input/Output) package contains a simple API for Java-based RDF parsers and writers. Parsers and writers for popular RDF serialisations are distributed along with RDF4J, and users can easily extend the list by putting their parsers and writers on the Java classpath when running their application. RDF4J supports two query languages: SPARQL and SeRQL. RDF4J's RDF database API differs from comparable solutions in that it offers a stackable interface through which functionality can be added, and the storage e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Notation 3
Notation3, or N3 as it is more commonly known, is a shorthand non-XML serialization of Resource Description Framework models, designed with human-readability in mind: N3 is much more compact and readable than XML RDF notation. The format is being developed by Tim Berners-Lee and others from the Semantic Web community. A formalization of the logic underlying N3 was published by Berners-Lee and others in 2008. N3 has several features that go beyond a serialization for RDF models, such as support for RDF-based rules. Turtle is a simplified, RDF-only subset of N3. Examples The following is an RDF model in standard XML notation: Tony Benn Wikipedia may be written in Notation3 like this: @prefix dc: . dc:title "Tony Benn"; dc:publisher "Wikipedia". This N3 code above would also be in valid Turtle syntax. Comparison of Notation3, Turtle, and N-Triples See also * N-Triples * Turtle (syntax) External linksNotation 3 W3C Submission [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Resource Description Framework
The Resource Description Framework (RDF) is a World Wide Web Consortium (W3C) standard originally designed as a data model for metadata. It has come to be used as a general method for description and exchange of graph data. RDF provides a variety of syntax notations and data serialization formats with Turtle (Terse RDF Triple Language) currently being the most widely used notation. RDF is a directed graph composed of triple statements. An RDF graph statement is represented by: 1) a node for the subject, 2) an arc that goes from a subject to an object for the predicate, and 3) a node for the object. Each of the three parts of the statement can be identified by a URI. An object can also be a literal value. This simple, flexible data model has a lot of expressive power to represent complex situations, relationships, and other things of interest, while also being appropriately abstract. RDF was adopted as a W3C recommendation in 1999. The RDF 1.0 specification was published in 2004, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sesame (framework)
Eclipse RDF4J (formerly OpenRDF Sesame) is an open-source framework for storing, querying, and analysing RDF data. It was created by the Dutch software company Aduna as part of "On-To-Knowledge", a semantic web project that ran from 1999 to 2002. It contains implementations of an in-memory triplestore and an on-disk triplestore, along with two separate Servlet packages that can be used to manage and provide access to these triplestores, on a permanent server. The RDF4J Rio (RDF Input/Output) package contains a simple API for Java-based RDF parsers and writers. Parsers and writers for popular RDF serialisations are distributed along with RDF4J, and users can easily extend the list by putting their parsers and writers on the Java classpath when running their application. RDF4J supports two query languages: SPARQL and SeRQL. RDF4J's RDF database API differs from comparable solutions in that it offers a stackable interface through which functionality can be added, and the storage e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jena (framework)
Apache Jena is an open source Semantic Web framework for Java. It provides an API to extract data from and write to RDF graphs. The graphs are represented as an abstract "model". A model can be sourced with data from files, databases, URLs or a combination of these. A model can also be queried through SPARQL 1.1. Jena is similar to RDF4J (formerly OpenRDF Sesame); though, unlike RDF4J, Jena provides support for OWL (Web Ontology Language). The framework has various internal reasoners and the Pellet reasoner (an open source Java OWL-DL reasoner) can be set up to work in Jena. Jena supports serialisation of RDF graphs to: *a relational database *RDF/XML *Turtle * TriG *Notation 3 *JSON-LD Versions After Apache integration Jena was integrated as a project under the umbrella of The Apache Software Foundation in April 2012, after having been in the Apache Incubator since November 2010. Before Apache integration Jena was created by HP Labs and was on SourceForge since 2001, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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