根据常理，实现必须能够反编组有效的文档。
The common base is that implementations must be able to unmarshal valid documents.
这有一点像反范式(de - normalized)，允许使用xmltable函数或带注释的模式非常容易而有效地进行分解。
It is somewhat de-normalized and allows for very easy and efficient shredding with either the XMLTABLE function or annotated schemas.
在这些组合中，只有一个有效，其余三个都会导致反模式。
Only one of these combinations works out well, the other three lead to anti-patterns.
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