+ std::string const polyglossiaOpts() const { return polyglossia_opts_; }
+ /// Is this language only supported by polyglossia?
+ bool isPolyglossiaExclusive() const;
+ /// Is this language only supported by babel?
+ bool isBabelExclusive() const;
+ /// quotation marks style
+ std::string const quoteStyle() const { return quote_style_; }
+ /// requirement (package, function)
+ std::string const requires() const { return requires_; }
+ /// provides feature
+ std::string const provides() const { return provides_; }