check (bool) – if True, check the result for PFA semantic errors (default True); Note: if the PrettyPFA contains any unresolved substitutions (in <<Frenchquotes>>), it will not be checked
version (string or None) – version of the PFA language to use while interpreting (None defaults to titus.version.defaultPFAVersion)
subs (dict from substitution names to substitutions) – replacement values as PFA titus.pfaast.Ast, PrettyPFA strings, or PFA Pythonized JSON
subs2 (dict from substitution names to substitutions) – added to subs (a more convenient way to pass them)