NEPOMUK (framework)
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| Written in | C++, Java |
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| Type | Semantic desktop |
| License | Various (BSD-style preferred) |
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NEPOMUK (Networked Environment for Personal, Ontology-based Management of Unified Knowledge) is an open-source software specification that is concerned with the development of a social semantic desktop that enriches and interconnects data from different desktop applications using semantic metadata stored as RDF. Between 2006 and 2008 it was funded by a European Union research project of the same name that grouped together industrial and academic actors to develop various Semantic Desktop technologies.
From KDE Applications 4.13 onwards, the 'Baloo file indexing and file search framework' replaces NEPOMUK.
Three active implementations of NEPOMUK exist: A C++/KDE-based variant, a Java-based variant, and a commercial version. More versions were created during the EU project between 2006 and 2008, some active beyond the project.
NEPOMUK-KDE was originally featured as one of the newer technologies in KDE Software Compilation 4. It used Soprano as the main RDF data storage and parsing library, while handling ontology imports through the Raptor parser plugin and the Redland storage plugin; all RDF data was stored by Virtuoso which also handled full-text indexing. On a technical level, NEPOMUK-KDE allowed associating metadata to various items present on a normal user's desktop such as files, bookmarks, e-mails, and calendar entries. Metadata could be arbitrary RDF. Tagging is the most user-visible metadata application.
As the KDE SC 4 series of releases progressed, it became apparent that NEPOMUK was not delivering the performance and user experience that had initially been anticipated. As a result of this, in KDE SC 4.13 a new indexing and semantic search technology Baloo was introduced, with a short transition period allowing applications to be ported and data to be migrated before the removal of NEPOMUK. Baloo initially used SQLite but currently uses LMDB for storage, and Xapian for searching.
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