...

NCBO hosts a repository of biomedical ontologies.  These ontologies are stored in formats that are not understood by i2b2.  A tool has been developed to not only extract these ontologies via bioportal REST services, but to transform them into a format that is understood by the i2b2 ONT cell.

Tutorials

i2b2 Ontology Tutorial  - Step by step example of how metadata trees are created and configured using both Edit View and Extraction tool

NCBO_Extraction_Overview    Similar to tutorial above but concentrates on what is needed to work with the NCBO Extraction tool.

NCBO _Extraction_Users_Guide   Extraction tool version 1.0User's Guide for the command line based NCBO Extraction tool

...