这个应用程序的功能仅仅检查用GML实例文档编码的地理特性是否包含至少一个几何元素。
The functionality of the application is simply to check whether the geographic features encoded in a GML instance document contains at least one geometry element.
不断地检查 if x in otherlist 会导致效率成 big-O 式几何级数递减；在两个固定排序的列表之间进行平行匹配的效率要高得多。
Constantly asking if x in otherlist runs into geometric big-O inefficiencies; marching in parallel between two stably-sorted lists is more efficient. For example
其他BIM软件需要将IFC的几何表示转换为其内部的数据结构，而IFC认证就是检查该转换过程是否正确。
Other BIM software has to interpret the IFC geometry into its own internal structure. The certification checks whether this takes place correctly.
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