Complete initializer describing a syntax problem.
Parameters:
grammarName - name of grammar in which problem is encountered.
grammarLocation - URL location of grammar in which problem is encountered.
ruleName - name of rule within grammar in which problem is encountered.
importName - name in grammar import declaration in which problem is encountered.
lineNumber - line number in grammar formatted file for problem.
charNumber - character number in line in grammar formatted file for problem.
message - printable string describing problem.