信息型文本强调语言的信息功能。语言信息功能的核心是外在的语境，话题的事实， 语言之外的因素等。
The core of the informative function of language is external situation , the facts of a topic, reality outside language, including reported ideas or theories.
语言的交际功能和表达功能都是受到超语言信息的制约。
The interactional and expressive functions of a language are restricted by extra linguistic message.
在总结现有的功能定义和功能表示方法的基础上，提出了以EXPRESS语言描述的概念设计产品功能信息模型。
The product function information models described in EXPRESS are proposed here after surveying on the definitions and the representations of product function.
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