class virtual['level]prioritizer :object..end
The base class for prioritizers. Defines methods for converting priority levels into 1) their corresponding code, and 2) their corresponding message tag.
method virtual code : 'level -> Priority.tUse p#code v to convert the priority level v to a priority
code with the prioritizer p.
method virtual tag : 'level -> stringUse p#tag v to convert the priority level v to a message
tag with the prioritizer p.