OTS — unknown context issue

Currently the text states that an importing domain that does not understand activity_specific_information encoded within the context (typically determined by looking at the type field) should simply null them out (or replace them with its own). I'd like to suggest that we change this so that the importing domain throws an exception, and does no work on behalf of that invocation. This is because typically this data will be dependant upon the specific extended transaction model in use, and an importing domain could corrupt data if it doesn't use the entire context correctly.

As per summary