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eagle-i software is predicated upon the principle of ontology layering. Applications are driven by an application layer ontology that complements and annotates a domain ontology. An application layer ontology encapsulates the specifics of the software behavior and is not meant to be reusable in and of itself, in contrast to a domain ontology. The domain ontology used in the current eagle-i stack is the ERO (eagle-i resource ontology). The layering principle is applicable to other domain ontologies.

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The runtime model that represents the ontology to the applications is built by loading the domain and application ontologies and interpreting the annotations in different ways. The memory model is organized as a core model fully stored in memory and a collection of referenced taxonomy models stored in Solr indexes for rapid access.

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