  Leitgeb and Ladyman (2008) note that in the case of mathematical structures there is nothing to rule out the possibility that the identity and diversity of objects in a structure is a primitive feature of the structure as a whole that is not accounted for by any other facts about it. Ladyman (2007) also discusses such primitive contextual individuality. One important question so far not discussed is whether on the contextualist view the identity and diversity of the objects depends on the whole structure or just part of it. The relationship between OSR and PII is assessed in Ainsworth (2011). Ladyman, Linnebo, and Richard Pettigrew (2013) present some relevant results in philosophical logic.