ForeignKeys in objects for edge parameters in the datapackage reader

[simnh]

I encountered some problems when setting timedependent parameters via a json object:

Setting this on in a field {'max': max_profile} and then having an additional resource where max_profile is on field containing the data. The datapackage reader should be able to resolve this. However, I could not make this work...

@gnn do you know how the meta data foreignKey has to be specified?