清单9描述了这种变化，子元素由一个简单元素(没有子结构)组成。
This change is described in Listing 9, where the subelements of are composed in one plain element (with no substructure).
choice 数据类型描述了这样一个结构，其中只有一个子元素可以是活动的或者可供选择。
The xsd:choice data type describes a structure in which only one of its child elements can be active or selected.
本文描述了用于多重动态子结构分析的计算机绘图原理和算法，并阐明了软件SVGRS的实现过程和功能。
In this paper, principle and algorithm of computer plotting for multiple dynamic substructure analysis are described. The realization process and functions of the software SVGRS are also illustrated.
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