Jena (framework)
Encyclopedia
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
and updated through SPARUL
.
Jena is similar to Sesame
; though, unlike Sesame, 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:
is an RDF
server.
The goal of Joseki is to provide an HTTP interface to RDF data. It fully supports SPARQL
for querying and updating. The project is a sub-project of Jena and is developed as a Java EE application. Joseki can also be run stand-alone server as it ships preconfigured with the Jetty
web server.
Open source
The term open source describes practices in production and development that promote access to the end product's source materials. Some consider open source a philosophy, others consider it a pragmatic methodology...
Semantic Web
Semantic Web
The Semantic Web is a collaborative movement led by the World Wide Web Consortium that promotes common formats for data on the World Wide Web. By encouraging the inclusion of semantic content in web pages, the Semantic Web aims at converting the current web of unstructured documents into a "web of...
framework for Java
Java (programming language)
Java is a programming language originally developed by James Gosling at Sun Microsystems and released in 1995 as a core component of Sun Microsystems' Java platform. The language derives much of its syntax from C and C++ but has a simpler object model and fewer low-level facilities...
. It provides an API to extract data from and write to RDF
Resource Description Framework
The Resource Description Framework is a family of World Wide Web Consortium specifications originally designed as a metadata data model...
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
SPARQL
SPARQL is an RDF query language; its name is an acronym that stands for SPARQL Protocol and RDF Query Language. It was made a standard by the RDF Data Access Working Group of the World Wide Web Consortium, and considered as one of the key technologies of semantic web...
and updated through SPARUL
SPARUL
SPARUL, or SPARQL/Update, is an extension to the SPARQL query language that provides the ability to add, update, and delete RDF data held within a triple store...
.
Jena is similar to Sesame
Sesame (framework)
Sesame is an open-source framework for querying and analyzing RDF data. It was created, and is still being maintained, by the Dutch software company . It was originally developed as part of the "On-To-Knowledge", a semantic web project that ran from 1999 to 2002. It contains a triplestore.Sesame...
; though, unlike Sesame, Jena provides support for OWL (Web Ontology Language
Web Ontology Language
The Web Ontology Language is a family of knowledge representation languages for authoring ontologies.The languages are characterised by formal semantics and RDF/XML-based serializations for the Semantic Web...
). 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 databaseRelational databaseA relational database is a database that conforms to relational model theory. The software used in a relational database is called a relational database management system . Colloquial use of the term "relational database" may refer to the RDBMS software, or the relational database itself...
- RDF/XMLRDF/XMLRDF/XML is a syntax, defined by the W3C, to express an RDF graph as an XML document. According to the W3C, "RDF/XML is the normative syntax for writing RDF"....
- TurtleTurtle (syntax)Turtle is a serialization format for Resource Description Framework graphs. A subset of Tim Berners-Lee and Dan Connolly's Notation3 language, it was defined by Dave Beckett, and is a superset of the minimal N-Triples format. Unlike full N3, Turtle doesn't go beyond RDF's graph model...
- Notation 3Notation 3Notation3, 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...
Joseki
JosekiJoseki (RDF server)
Joseki is a servlet providing a web interface for performing SPARQL queries on an RDF graph. It has been developed by Hewlett Packard, and released under a license apparently equivalent to the MIT license....
is an RDF
Resource Description Framework
The Resource Description Framework is a family of World Wide Web Consortium specifications originally designed as a metadata data model...
server.
The goal of Joseki is to provide an HTTP interface to RDF data. It fully supports SPARQL
SPARQL
SPARQL is an RDF query language; its name is an acronym that stands for SPARQL Protocol and RDF Query Language. It was made a standard by the RDF Data Access Working Group of the World Wide Web Consortium, and considered as one of the key technologies of semantic web...
for querying and updating. The project is a sub-project of Jena and is developed as a Java EE application. Joseki can also be run stand-alone server as it ships preconfigured with the Jetty
Jetty (web server)
Jetty is a pure Java-based HTTP client/server, WebSocket client/server and servlet container developed as a free and open source project as part of the Eclipse Foundation...
web server.
See also
- SesameSesame (framework)Sesame is an open-source framework for querying and analyzing RDF data. It was created, and is still being maintained, by the Dutch software company . It was originally developed as part of the "On-To-Knowledge", a semantic web project that ran from 1999 to 2002. It contains a triplestore.Sesame...
- JRDFJRDF (framework)JRDF is an open source RDF framework for Java. It provides an object oriented model of RDF graphs including URIs, Literals and Blank Nodes. It was initially released in 2003 from work on the TKS and Kowari triple stores in order to provide an API that could be used to bridge other APIs such as...
- CubicWebCubicWebCubicWeb is an 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 for internal uses such as intranet, bug tracker and forge...
- MulgaraMulgara (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:...