Any default constraints defined for columns must be the same.
为列定义的所有默认约束必须相同。
In XML parsers, validation is usually turned off by default because many XML authors are not writing constraints; leaving it off helps to avoid lengthy processing in production environments.
在xml语法分析器中，验证在缺省情况下通常关闭，这是因为很多xml作者都不编写约束；将其关闭可帮助避免产品环境中的冗长处理。
Also, special attention is needed on queries that retrieve all values except the default ones by using comparison constraints.
还要特别注意使用比较约束检索默认值以外的所有数据的查询。
Maps the specified URL route and sets default route values and constraints.
映射指定的url路由并设置默认的路由值和命名空间。
Maps the specified URL route and sets default route values and constraints.
映射指定的url路由并设置默认的路由值和命名空间。
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