Mulgara (software)

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]

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

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]

gollark: Well, I patched *that*, and that makes sense since it actually deals with environments.
gollark: But *why* would it meddle with the environment and apparently *only* for getfenv?
gollark: No.
gollark: This may require testing. It's not impossible that *somehow* `pcall` is using the "real" environment, but I have no idea what would cause htat.
gollark: ```lua -- if function is not from within the VM, return env from within sandbox function environment.getfenv(arg) local env if type(arg) == "number" then env = gf(arg + 1) else gf(arg) end if not env or env._HOST and string.find(env._HOST, "YAFSS") == nil then return gf() else return env end end```

See also

References
  1. Mulgara | Semantic Store - Frequently Asked Questions
  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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