The data model that you are looking is modified since beta1. ElectronicSource now contains only a ‘Reference’ to an external resource. But we should be able to associate ScholarlyWork objects with it. ScholarlyWork now contains most of the Date fields. What resource types to support and what properties should go with each resource type was/is a difficult question. There is always a possibility of missing out something. So, we’ve kept a window open for custom properties using the ResourceProperty