These rules suggest that an application cannot predict the concrete feature element names or geometry element names that might appear in a GML instance document.
这些规则表明一个应用程序不能预知具体的特性元素名或几何元素名，它们有可能出现在 GML 实例文档。
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.
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。
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