Declaration of constants? #14
Description
Is there a way to declare constants using sbol_factory?
For example, SBOL has the term sbol#reverseComplement for indicating directions, and this is declared in the SBOL3 OWL ontology: https://github.com/SynBioDex/sbol-owl3/blob/17c89abc9990deb9931eb64ad788f104670f9c08/sbolowl3.rdf#L819