New Post: Adding a metadata attribute?

The generator is setup so you can add whatever attribute you need to your classes. See WritePocoClassAttributes.

For example:

AdditionalNamespaces = new[] { "System", "System.ComponentModel.DataAnnotations" };

Action<Table> WritePocoClassAttributes = t =>
{
    WriteLine("    [MetadataType(typeof(" + t.ClassName + "Metadata))]");
};

You would then have to add the <class>Metadata classes to your project separately.