CHEBI for Complex Search
A good deal of the complexity of the CHEBI ontology lies in the connections between the chemicals. It is typical of OBO ontologies to include complex interrelationships between the entities they define. CHEBI makes a particularly good pedagogical example of OBO style because of its relatively small size (only 20,000 concepts) and the small number of relationships between the chemicals it records.
Using our example chemical glyphosate, the fact that it is an herbicide is represented in CHEBI as
The first thing to notice in this style of modeling is that every concept is represented in OWL as an owl:Class; the chemical ...
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