/// the backends appropriate for use with this document.
/// so, e.g., latex is excluded , if we're using non-TeX fonts
std::vector<std::string> backends() const;
/// the backends appropriate for use with this document.
/// so, e.g., latex is excluded , if we're using non-TeX fonts
std::vector<std::string> backends() const;
/** Use the Pimpl idiom to hide those member variables that would otherwise
* drag in other header files.
*/
/** Use the Pimpl idiom to hide those member variables that would otherwise
* drag in other header files.
*/