more flexible command syntax;

less markup (amending 07ad0b407d38): const = "" is mainly for parentheses syntax -- avoid entity_markup here;

more markup reports: notably "notation=..." within pretty blocks;

more parse tree positions;

more operations;

clarified order for 'print_syntax' command;

more accurate parse tree: retain all tokens (and thus positions);

more thorough markup reports (amending 0c6a600c8939 and 7f9e8516ca05): descend into vacuous nodes;

clarified comparison: prefer authentic nonterminal context, instead of somewhat accidental "const";

more detailed parse tree: retain nonterminal context as well;

clarified persistent data;

clarified input and output: support markup blocks via Bg/En; clarified datatype tree vs. tree_ops: reconstruct nested markup blocks via make_tree; clarified tree_ops_ord: ignore markup blocks, proceed like dict_ord;

tuned;

tuned;

more operations;

clarified output: count Tip entries;

tuned signature;

tuned whitespace;

clarified signature: more explicit type "output"; minor performance tuning of output_ord: static length;

clarified signature;

tuned: more uniform;

tuned: more uniform;

tuned;

minor performance tuning;

tuned;

tuned;

minor performance tuning;

partial revert of d97fdabd9e2b, to build old documentation more reliably;

tuned signature;

tuned signature;

tuned signature;

clarified signature;

minor performance tuning: proper table for parsetree list; tuned signature;

unused (see 954e9d6782ea);

tuned;

unused (see 7c1e73540990);

minor performance tuning (NB: order of prods / states does not matter);

tuned;

tuned;

tuned comments;

tuned;

pro-forma support for markup blocks, without any change of result yet;

tuned;

merged

proper 'no_syntax' declarations (amending 8e72f55295fd);

tuned, following make_symbs in src/Pure/Syntax/printer.ML;

clarified use of Lexicon.dummy; tuned signature;

unused (see 584828fa7a97);

tuned;

tuned;

tuned: prefer ML over prose;

eliminated redundant nt_count: rely on Symtab.size; tuned signature: more standard argument order;

eliminate unused prod_count (see also 7afca3218b65);

tuned;

more markup;

minor performance tuning: prefer static values;

tuned;

more markup;

clarified persistent datatype: more direct literal_markup, which also serves as a flag;

tuned signature;