+typedef std::map<std::string, std::vector<ArgumentType> > CommandMap;
+typedef std::map<std::string, FullCommand> FullCommandMap;
+typedef std::map<std::string, FullEnvironment> FullEnvironmentMap;
+
+/// Known TeX commands with arguments that get parsed into ERT.
+extern CommandMap known_commands;
+/// Known TeX environments with arguments that get parsed into ERT.
+extern CommandMap known_environments;
+/// Known TeX math environments with arguments that get parsed into LyX mathed.
+extern CommandMap known_math_environments;
+/// Commands that might be defined by the document class or modules
+extern FullCommandMap possible_textclass_commands;
+/// Environments that might be defined by the document class or modules
+extern FullEnvironmentMap possible_textclass_environments;
+///
+extern bool noweb_mode;
+/// Did we recognize any pdflatex-only construct?
+extern bool pdflatex;
+/// Did we recognize any xetex-only construct?
+extern bool xetex;
+/// Do we have CJK?
+extern bool have_CJK;
+/// Do we have non-CJK Japanese?
+extern bool is_nonCJKJapanese;
+/// LyX format that is created by tex2lyx
+extern int const LYX_FORMAT;
+
+/// path of the master .tex file
+extern std::string getMasterFilePath();
+/// path of the currently processed .tex file
+extern std::string getParentFilePath();
+
+
+/*!
+ * Reads tex input from \a infilename and writes lyx output to \a outfilename.
+ * The (latex) encoding can be provided as \a encoding.