Overrides refer to nonterminal modifications or extensions to a fixed base grammar for the purpose of extending the language or customizing the parse to the task ...

Parsing refers to one of a number of methods for modifying a grammar or parser in such a way as to allow for parsing to continue in the presence of parts of the input ...

Factoring is a general method for separating various orthogonal attributes of source code in order to simplify and clarify manipulation and transformation by handling ...