cco-merged - Contains the current CCO merged release file and an import file that is used to generate the merged CCO file.
cco extensions - Contains versions of CCO extensions maintained by the governance board, such as the Modal Relations Ontology.
cco-modules - Contains versions of the 11 CCO modules listed below:

Ontology Name	Description
Geospatial Ontology	An ontology whose scope is the representation of sites, spatial regions, and other entities, especially those that are located near the surface of Earth, as well as the relations that hold between them.
Information Entity Ontology	An ontology whose scope is the representation of generic types of information as well as the relationships between information and other entities.
Event Ontology	An ontology whose scope is the representation of processual entities, especially those performed by agents, that occur within multiple domains.
Time Ontology	An ontology whose scope is the representation of temporal regions and the relations that hold between them.
Agent Ontology	An ontology whose scope is the representation of agents, especially persons and organizations, and their roles.
Quality Ontology	An ontology whose scope is the representation of a range of attributes of entities especially qualities, realizable entities, and process profiles.
Units of Measure Ontology	An ontology whose scope is the representation of standard measurement units that are used when measuring various attributes of entities.
Currency Unit Ontology	An ontology whose scope is the representation of currencies that are issued and used by countries.
Facility Ontology	An ontology whose scope is the representation of buildings and campuses that are designed to serve some specific purpose, and which are common to multiple domains.
Artifact Ontology	An ontology whose scope is the representation of artifacts that are common to multiple domains along with their models, specifications, and functions.
Extended Relations Ontology	An ontology whose scope is the representation of the relations that hold between entities at the level of the mid-level Common Core Ontologies.