Syntactic and semantic level description of the surface text. The understanding makes on the surface text can be shown in different levels. Syntactic categories level gives a syntactical class for each constituent of the sentence. Syntactic relations level describes syntactical function of each constituent of the sentence to predicate of the sentence. Argument categories level offers the semantic concept for each constituent of the sentence. Predicate-argument relation level helps in understanding the semantic role played by each constituent or argument related to its predicate.