We have suggested a number of 'types' of relationships that can be made - recorded as attribute @type for RelationshipAssertions (prieviously known as Assertions) and Relationships. Please look at section 2.3 of the complemetary document in DraftStandardDocumentation where we have listed these relationships and divided them into groups. This list is not exhaustive and we are not taxonomists :-), so should be considered open for revision. Also the definitions given in the documentation are not nescessarily from taxonomic experts..... TrevorPaterson 01 September
General Relationship type discussion
Comments on types of taxon concepts relationship