Data model

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SKOS is a common data model for sharing and linking knowledge organization systems via the Web. Many knowledge organization systems, such as thesauri, taxonomies, classification schemes and subject heading systems, share a similar structure, and are used in similar applications. SKOS captures much of this similarity and makes it explicit, to enable data and technology sharing across diverse applications.

Search-Based Applications (SBAs)

Freebase is a large collaborative knowledge base. It is an online collection of structured data harvested from many sources, including individual 'wiki' contribution.[1] Freebase aims to create a global resource which allows people (and machines) to access common information more effectively. It is developed by the American software company Metaweb and has been running publicly since March 2007.

SIREn: Efficient semi-structured Information Retrieval for Lucene
Efficient, large scale handling of semi-structured data (including RDF) is increasingly an important issue to many web and enterprise information reuse scenarios.

is an education and distribution site dedicated to open source software for converting, managing, viewing and manipulating structured data. Structured data can represent any existing data struct from the simplest attribute-value pair formats to fully specified relational database schema.