S_EL Language in Intelligent Engineering CAD Systems

Through the description of research environment, design principle andimplementation method of S- EL language in S- CAD system, a kind of expression model ofengineering language knowledge is introduced and demonstrated-. S- EL language is a speciallanguage combined with the characteristic of engineering language and developed with microsoftvisua C/C++, which consists of data structure types, expressions and grammar descriptions.and is used to express engineering experiences and standards. S- EL language is an importantportion of intelligent engineering CAD system.