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Semantics encoding
A semantics encoding is a translation between formal languages. For programmers, the most familiar form of encoding is the compilation of a programming language into machine code or byte-code. Conversion between document formats are also forms of encoding. Compilation of TeX or LaTeX documents to PostScript are also commonly encountered encoding processes. Some high-level preprocessors such as OCaml's Camlp4 also involve encoding of a programming language into another.
Formally, an encoding of a language A into language B is a mapping of all terms of A into B. If there is a ''satisfactory'' encoding of A into B, B is considered ''at least as powerful'' (or ''at least as expressive'') as A.
== Properties ==
An informal notion of translation is not sufficient to help determine expressivity of languages, as it permits trivial encodings such as mapping all elements of A to the same element of B. Therefore, it is necessary to determine the definition of a "good enough" encoding. This notion varies with the application.
Commonly, an encoding is expected to preserve a number of properties.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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