在创建一个线shapefile时，如果系统提示添加一个点，一个警告就会写入到标准错误以表明此形状被忽略。
While creating a line shapefile, if you are prompted to add a point, a warning is written to standard error indicating that the shape was ignored.
在创建一个点shapefile时，若系统提示添加一个多线形状，那么就以单个点添加每个顶点。
While creating a point shapefile, when you are prompted to add a polyline shape, add each vertex as an individual point.
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