Mulgara (software)
| Stable release | 2.1.13
/ January 10, 2012 |
|---|---|
| Repository | |
| Written in | Java |
| Type | Semantic Web |
| License | Open Software License |
| Website | mulgara |
Mulgara is a triplestore and fork of the original Kowari project. It is open-source, scalable, and transaction-safe.[1] Mulgara instances can be queried via the iTQL query language and the SPARQL query language.[2]
History
[edit]Kowari was first made available for download in beta form on October 26, 2003.[3] In April 2004,[4] 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, including version 1.0.5 and 1.1 pre-release. The development of TKS stalled due to difficulties with funding at the end of 2004,[5] while the development of Kowari continued on.[6]
In September 2005, Tucana was bought by Northrop Grumman.[7] In January 2006, Northrop Grumman threatened a Kowari developer with legal action if he released any new version of Kowari.[8] 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 stopped[9] and the community moved to Mulgara. The legal cloud surrounding Kowari was eventually resolved,[10] one of the outcomes was the adoption of the Open Software License 3.0[permanent dead link][citation needed]. Since 2008 all new code is being licensed with the Apache 2.0 License.[2]
Since 2006 Mulgara 1.0.0 has been released, significant changes to the transaction architecture was made to support JTA, SPARQL support, a Jena API, and integration with Sesame has been added. As of January 10, 2012 the latest version is 2.1.13.[11]
Internals
[edit]Mulgara is not based on a relational database due to the large numbers of table joins encountered by relational systems when dealing with metadata. Instead, Mulgara is a completely new database optimized for metadata management. Mulgara models hold metadata in the form of short subject-predicate-object statements, much like the W3C's Resource Description Framework (RDF) standard. Metadata may be imported into or exported from Mulgara in RDF or Notation 3 form.[1]
See also
[edit]
References
[edit]- ^ a b Mulgara | Semantic Store - Frequently Asked Questions
- ^ a b Welcome to the new Mulgara project!
- ^ Kowari Developer Beta Release
- ^ Massive Scalability for RDF Storage and Analysis, David Wood, Tom Adams, Andrew Newman
- ^ Changes at Tucana Technologies
- ^ Kowari Developers Archive[permanent dead link]
- ^ Northrop Grumman Acquires Proprietary Software from Tucana Technologies
- ^ "Kowari-developers In hope of resolution.". Archived from the original on 2012-11-08. Retrieved 2008-10-18.
- ^ SourceForge.net: Kowari
- ^ Kowari Legal Status Archived 2010-07-07 at the Wayback Machine
- ^ Mulgara News