Note: as with pure data-centric markup, beware of illegal characters weaseling into XML element names.
注意:就纯数据为中心的标记而言,一定要小心那些混入XML元素名称中的非法字符。
2
Note that this figure may not exactly be pure UML, as UML is usually used to model a single system, whereas the sample application is really composed of three systems.