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Furthermore, when mapping source data to the i2b2 data model, there is often more than one way to represent the characteristics of the source data elements. This is especially true for integrating data from heterogenous sources or from different research projects when several conceptual models need to be harmonized (late mapping).

This wiki page will try to provide a better understanding of the i2b2 ontology model and its versatility to address common problems. After a short introduction to the terminology and the database schema, it will also mention advanced features like modifiers and XML blobs.

Best practices for i2b2 ontology construction will also include:

• Creating an optimal hierarchy of rusers
• Naming concepts and folders
• Using concepts vs. using modifers
• Using XML blobs
• Partitioning of the i2b2 ontology tables
• Miscellaneous

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