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NCI EVS is the lead adopter site for the open source public domain terminology server LexBIG, which is being developed by the Mayo Clinic as part of the caBIG program. Effective with the release of EVS/caCORE 4.0, LexBIG provides the base terminology server infrastructure for EVS. EVS/caCORE 4.0 relies on LexBIG version 2.1.1.

LexBIG is based on the LexGrid Data Model, Mayo's standard data model for storage of controlled vocabularies and ontologies. The LexGrid Model defines how vocabularies should be formatted and represented programmatically, and is intended to be flexible enough to accurately represent a wide variety of vocabularies and other lexically-based resources. The model also defines several different server storage mechanisms (for example, relational database, LDAP) and a XML format. This model provides the core representation for all data managed and retrieved through the LexBIG system, and is rich enough to represent vocabularies provided in numerous source formats including:

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This common model is a critical component of the LexBIG project and EVS/caCORE 4.0. Once disparate vocabulary information can be represented in a standardized model, it becomes possible to build common repositories to store vocabulary content and to build common programming interfaces and tools to access and manipulate that content.

LexBIG has three major components:

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