'''Record a configuration action

        The job of most directives is to compute actions for later pro\
cessing.
        The action method is used to record those actions.  The discri\
minator
        is used to to find actions that conflict. Actions conflict if \
they
...                                                                    

'''Check for duplicate imports of the same file.

        Raises an exception if this file had been processed before.  T\
his
        is better than an unlimited number of conflict errors.
        '''                                                            

'Check whether a named feature is available in this context.'          

''                                                                     

'''Compute a full file name for the given file

        If the filename is relative to the package, then the returned
        name will include the package path, otherwise, the original
        file name is returned.
        '''                                                            

'Record that a named feature is available in this context.'            

'''Resolve a dotted name to an object

        A dotted name is constructed by concatenating a dotted module
        name with a global name within the module using a dot.  For
        example, the object named "spam" in the foo.bar module has a
        dotted name of foo.bar.spam.  If the current package is a
        prefix of a dotted name, then the package name can be relaced
        with a leading dot, So, for example, if the configuration file
...