How to get to the entity schema's in CRM Online
If you plan and doing integration using the web services, you may find it useful to have access to the entity schema's.
https://<org name>.crm.dynamics.com/sdk/list.aspx
The entity schemas will give the definition of all the entities in the system. You can use them to help you integrate CRM data into other systems. I'm working on an application that will map CRM data into a Word document and having the schema definitions at hand made it easier than having to re-create it.
-cheers
Jon
