ADO.NET Data Services ("Astoria") Service Metadata

You can access the SSDL (ADO.NET Entity Framework's store schema definition language, and *not* this one here) of your Astoria Data Service by appending $metadata to the base URL, like this:

http://localhost:7777/Services/Data/NW/$metadata

This metadata can e.g. be used to generate client-side code with the WebDataGen.exe tool, like this:

webdatagen /mode:ClientClassGeneration /uri:http://vmxpsp2:7777/Services/Data/NW /outobjectlayer:Northwind.cs

This creates entities which you can use to program against, for example by leveraging the Astoria client API.