Constructs a new concept type definition using the differentia graph
and the concept in that graph that acts as a formal parameter for
this definition.
Class which may be queried to verify that specific, independant
extensions to the API are available and also to activate or deactivate
any extended features.
Returns an array containing tokens that would have been accept in place of the
offending token related to this exceptionm, or null if none have been
specified.
An interface for information units relating to translation so they can be
given to different parsers and generators to ensure consistent
representations.