Scholarly material must be canonically citable. Canonical citation practice uses identifiers that are independent of any specific representation, and can identify either a notional object or a concrete version of an object in such a way that different versions of an object are explicitly identified as referring to a common notional object.
Any form of canonical citation implies a model of the object it identifies. The Homer Multitext project uses two forms of canonical citation.
In citing texts, we follow the OHCO2 model of texts as an ordered hierarchy of citation objects.
All other scholarly references are cited following the CITE2 model of unique objects in versioned collections.