不同于rdbms值可以是不同的类型，Row仅包含一种类型，即字符串类型。

While RDBMS values can be of different types, a Row contains only one, the string type.

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同样，标记子树(即“emph”、“strong”、“module”、“code”和“title”)折叠为一个类型正确的单独节点，并包含一个复合字符串。

Likewise, markup subtrees (i.e. "emph", "strong", "module", "code", "title") are collapsed to a single node of the right type, and containing a compound string.

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索引器(即索引属性)，应将整型或字符串类型用于索引。

Indexers, that is, indexed properties, should use integer or string types for the index.

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