The ontology is a structure of terms derived from taxonomic relations between objects --- stores data for Wikimedia projects, esp. Wikipedia.
For a list of top-level categories in the classification: https://www.wikidata.org/wiki/Wikidata:WikiProject_Ontology/Top-level_ontology_list
Immediate children of ‘entity’ (https://angryloki.github.io/wikidata-graph-builder/)
is a generic model.
The Ontology is mainly about reaching deep into the nature of being, becoming, existence, and reality, and applying those insights during maintenance tasks. The more practical aims of the project are:
- to support a broad semantic interoperability between notable ontologies like DOLCE, BFO, SUMO, Lemon, RDA, etc.
- to build consensus around the main branches of our core concept tree and how they relate to each other
- to gain a deep understanding about the meaning of our upper ontology and to transfer this knowledge to others in practical terms