Ada library for creating grammar parsers and lexers. Supports not entirely 8 piece streams but also Unicode and regular streams of arbitrary objects. Powerful, flexile and extensible. Creates syntax tree. Has all criterion parser constructs (alternatives, optional element etc.) and various pre-defined more complex constructs (e.g. different kinds of repetition). These constructs take regular variations for subtly different needs (e.g. for different representation of data to be extracted). Arbitrary reliable look-ahead. No distinction between parser and lexer. Object oriented. Documented.