10. A computer system, comprising: a memory for storing data for access by an application program being executed on a computer system, wherein the data relates to a syntactical and semantic model of a natural language, the data comprising a semantic description of entities expressed in the natural language, parametric characteristics of the natural language, and semantic relations with entities of the natural language; and a processor, coupled to the memory; wherein the memory is configured to store a data structure, the data structure comprising: a plurality of language-independent entities represented by a plurality of semantic classes, wherein the semantic classes are arranged into a hierarchy, wherein each of the plurality of semantic classes includes at least one semantic attribute and a semantic model, and wherein the semantic attributes and the semantic models are inherited from parent units to child units; a plurality of descriptions of semantic relations with the entities, wherein the descriptions of semantic relations are represented by a hierarchical sequence of elements; a plurality of syntactic descriptions of the natural language, wherein one or more of the plurality of syntactic descriptions are associated with one or more semantic descriptions and one or more lexical descriptions of the natural language; a plurality of lexical descriptions of the natural language, wherein one or more of the plurality of lexical descriptions of the natural language are associated with one or more of said syntactical descriptions and one or more of said semantic descriptions; and a plurality of morphological descriptions of the natural language, wherein one or more of the plurality of morphological descriptions of the natural language are associated with one or more of said plurality of lexical descriptions of the natural language, wherein the processor is configured to: receive a source sentence in a source language, analyze the source sentence using at least one of the plurality of language-independent entities, and represent the source sentence in a language-independent form, using at least one of the plurality of assigned descriptions of semantic relations, at least one of the plurality of syntactic descriptions of the natural language, at least one of the plurality of lexical descriptions of the natural language, and at least one of the plurality of morphological descriptions of the natural language.
16. The computer system of claim 10 , wherein the semantic description of a natural language further comprises: a plurality of deep slot descriptions, wherein each of the deep slot reflects a semantic relation in a sentence; a plurality of semantemes; and a plurality of pragmatic descriptions.