The PODS software maps those different schemas into a single, virtual schema for the entire system.
PODS软件把这些模式映射为一个虚拟模式，供整个系统使用。
However, if we are interested in HTML documents only, we can construct a virtual schema from the implicit structure of these files.
然而，如果仅限于HTML文档，我们就可以由这种文件的隐含结构建立一种虚拟模式。
However, if we are interested in HTML documents only, we can construct a virtual schema from the implicit structure of these files.
然而，如果仅限于HTML文档，我们就可以由这种文件的隐含结构建立一种虚拟模式。
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