1. The ChEBI ontology and OWL Industry Programme Ontology Tutorial European Bioinformatics Institute 13 October 2010 Janna Hastings EBI Chemoinformatics and Metabolism
17. OWL representation Without internal structure, all parts must be explicitly asserted (which leads to a combinatorial explosion for larger molecules) But the internal structure of complex molecules cannot be encoded in OWL ontology axioms due to their cycles does not have a model in the shape of a tree
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20. Chemical description graphs + Rules defined to detect cycles and parts Reasoning results: able to perform classification (but scalability a concern)