If you look in test.xbre you'll see an example for creating a generic Dictionary:
[code]<Assert id="dictionaryStringString" type="System.Collections.Generic.Dictionary`2[System.String,System.String]" /> [/code]
I haven't tried for a list, but I think that you can figure it out using this example.
2012-03-31 10:58:34 PDT in NxBRE