Semantic analysis, This is the phase that the message is analyze and establishthrough the elements of the text unlike the lexical or grammatical analyzes thatworks in a way that it relays the message either through a lexicon or a grammar.
Context-free grammar is more or less a language that works in a nested way. Thatallow one to parse well known expressions regardless of the smallest context-freegrammar. Though if you let many non nested cases, also reduces the nesting to alevel. 1e1e36bf2d