We are in the process of designing a Fedora repository for archival preservation of our digital content and have a question regarding best practices advice for the RELS-EXT datastream. The Fedora RELS-EXT ontology (http://www.fedora.info/definitions/1/0/fedora-relsext-ontology.rdfs
includes RDF properties for both directions of a relationship (e.g., “isPartOf” and “hasPart”). Do most installations implement both directions of such a relationship – i.e., the “whole” object has a RELS-EXT datastream with a “hasPart” relationship to each
of its “parts” _and
_ each “part” object has a RELS-EXT datastream with a “isPartOf” relationship to the corresponding “whole”? Or do you typically pick one side or the other to represent in RELS-EXT – either the “hasPart” relationship from whole to
_ the “isPartOf” relationship from part to whole _but not both
_? Interested in best practices advice, a sense of what the common practice is, etc.