Ontology Working Group
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The i2b2 database loading modules come with at least 3 sets of "metadata" or ontology trees. These are the demo ontology, the ACT ontology, and the ACT-on-OMOP ontology.

That may be the "demo" ontology, but it doesn't resemble the "ACT" ontology that our PI was showing us. How many different ontology trees does i2b2 have?

The i2b2 database loading modules come with at least 3 sets of "metadata" or ontology trees. These are the demo ontology, the ACT ontology, and the ACT-on-OMOP ontology.

Included Domains
NameDescription

Included Domains

(I don't think all domains can be listed, or it will be hard to understand. I think this merges with description and tries to convey the level of detail and comprehensiveness).

NameDescription

Target Data Model
i2b2 demo ontologydefault metadata from i2b2 authorsfixmei2b2 Common Data Model (star-schema); default CRC database has matching concepts
ACT ontologyENACT projectfixmei2b2 Common Data Model (star-schema); ACT CRC demo database has matching concepts
ACT-on-OMOP ontologyENACT projectfixmei2b2 Common Data Model (star-schema), but modified with views into the OMOP Common Data Model; CRC database loaded with SYNPUF demo data has matching concepts

That may be the "demo" ontology, but it doesn't resemble the "ACT" ontology that our PI was showing us. How many different ontology trees does i2b2 have?

The i2b2 database loading modules come with at least 3 sets of "metadata" or ontology trees. These are the demo ontology, the ACT ontology, and the ACT-on-OMOP ontology.

How about a thumbnail description of these ontologies? How do they differ from each other?

Sure. Here is a table describing the major differences among them.

NameDescriptionIncluded DomainsTarget Data Model
i2b2 demo ontologydefault metadata from i2b2 authorsfixmei2b2 Common Data Model (star-schema); default CRC database has matching concepts
ACT ontologyENACT projectfixmei2b2 Common Data Model (star-schema); ACT CRC demo database has matching concepts
ACT-on-OMOP ontologyENACT projectfixmei2b2 Common Data Model (star-schema), but modified with views into the OMOP Common Data Model; CRC database loaded with SYNPUF demo data has matching concepts

You just mentioned Domains. What do you mean by that?

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Ontology Working Group OWL