Mulgara Semantic Store
Stable release
2.1.13 / January 10, 2012 (2012-01-10)
Written inJava
TypeSemantic Web
LicenseOpen Software License
Websitemulgara.org

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

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. 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

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

References

  1. 1 2 Mulgara | Semantic Store - Frequently Asked Questions
  2. 1 2 Welcome to the new Mulgara project!
  3. ↑ Kowari Developer Beta Release
  4. ↑ Massive Scalability for RDF Storage and Analysis, David Wood, Tom Adams, Andrew Newman
  5. ↑ Changes at Tucana Technologies
  6. ↑ Kowari Developers Archive
  7. ↑ Northrop Grumman Acquires Proprietary Software from Tucana Technologies
  8. ↑ "Kowari-developers In hope of resolution.". Archived from the original on 2012-11-08. Retrieved 2008-10-18.
  9. ↑ SourceForge.net: Kowari
  10. ↑ Kowari Legal Status Archived 2010-07-07 at the Wayback Machine
  11. ↑ Mulgara News
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