Citations, DOIs, Pubmed IDs

Since we've started discussing the API for PyOpenWorm, we've started talking about putting up citations of data sources. What we're looking at doing is making a declarative API that allows us to write things like:

n1 = Neuron('AVAL')
n2 = Neuron('ADER')
r1 = n1.connectsWith(n2) # r1 is now a representation of this 'connectsWith' relationship
s = Chemical('X')
r2 = s.modulates(r) # r2 is the representation of the 'modulates' relationship
e = Evidence(doi="http://dx.doi.org/10.1007%2Fs00454-010-9273-0")
e.asserts(r2)

In English, "10.1007%2Fs00454-010-9273-0 suggests that chemical X modulates the connection between AVAL and ADER". This 'relationship' API (a sub-API to the PyOpenWorm API), has the primary feature of allowing statements made as to be part of higher order statements.