Again, how you populate the database and assign attributes and relationships is flexible and can be customized to suit the needs of any project.

同样，对数据库的填充、对属性和关系的分配是灵活的，可以进行定制以满足任何项目的需求。

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Assertions provide XML schema authors with a flexible way to control the occurrence and values of elements and attributes.

断言可以使XML模式作者灵活地控制元素和属性的出现和值。

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While it is quite flexible and makes it easy to add class, id, and style attributes, it has no mechanism to add title attributes.

虽然它非常灵活，很容易添加class、id和style属性，却无法添加title属性。

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