contextString.pl - Allow string-valued answers.
Implements contexts for string-valued answers.
You can add new strings to the context as needed via the Context()->strings->add() method. E.g.,
Context("String")->strings->add(Foo=>{}, Bar=>{alias=>"Foo"});
Use string_cmp() to produce the answer checker(s) for your correct values. Eg.
ANS(string_cmp("Foo"));