These eleven ontologies constitute a [mid-level ontology](https://arxiv.org/abs/2404.17757) that extends from the [Basic Formal Ontology (BFO)](https://github.com/bfo-ontology/BFO-2020), an [ISO-standard](https://www.iso.org/standard/71954.html) top-level ontology. Whereas BFO represents only the most generic entities and relations, CCO contains classes that users will find common across data sets in many domains. Such classes include, for example, person, facility, date, employment, nickname, and measurement.
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