存储策略筛选器用于检查候选存储区域的属性，确定哪些存储区域满足筛选器表达式。

Storage policy filters are used to examine the properties of candidate storage areas, and to determine which storage areas satisfy the filter expression.

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每个筛选器必须在转换标记前检查这些属性，以防止筛选器将已经转换的文档再次转换为文档。

Each filter must check for these properties before converting the markup so that a filter does not convert an already-converted document again into a document.

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在接下来的部分中，我们将会添加一个检查MySQL版本属性的单元确认器。

In the next section, we'll add a unit validator that checks the MySQL version attribute.

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