Represents an expression in the CPE Language.
This class allows match a CPE element against an expression in the CPE Language, that is, a XML document format for binding descriptive prose and diagnostic test to a CPE name (CPE Description Format).
Accepts a set of known CPE Names and an expression in the CPE language, and delivers the answer True if the expression matches with the set. Otherwise, it returns False.
True if self expression can be satisfied by language matching against cpeset, False otherwise.