The main goal of these languages is to define precise semantics of the notational elements, resulting in an expressive graphical language. 这些语言的主要目的是定义图元的准确语义，产生一个用于表示的图形化语言。
This method fulfills the needs of drawing vectorization accuracy and suitable for the vectorization applications of engineering drawing with minor arcs elements. 该方法完全实现了工程图元素的精确识别，特别适合包含少量非直线图元的工程图矢量化应用。
