Schema extension for integrating external relation types into the intrinsic–relational module schema

Develop schema-extension methods for the OntoKG intrinsic–relational module schema that can incorporate new relation types introduced by external sources such as large language model–extracted knowledge graphs by (i) mapping new relations to existing modules when appropriate, (ii) extending existing modules when partial alignment is possible, and (iii) introducing new modules when no faithful alignment exists.

Background

OntoKG organizes properties into intrinsic (node attributes) and relational (graph edges) modules within a declarative schema designed over the January 2026 Wikidata dump. The authors anticipate future expansion that integrates relations from external sources, particularly LLM-extracted knowledge graphs, which may not align cleanly with the existing module inventory.

A principled extension mechanism is needed to preserve schema coherence and portability while accommodating heterogeneous or novel relation types. The challenge is to decide when new relations can be mapped to existing modules, when modules need to be extended, and when entirely new modules must be created.