所有其他非字符实体类型都被忽略，而且不进行检验，即使对于内部子集中的声明。
All other non-character entity types are ignored, and no validation is performed, even for declarations within the internal subset.
在第一个实例中，字符串是一个直接的服务级别(例如GoldService)，在这种情况下它是已通过检验的、有效证书的CN。
In the first case, that string is an explicit service level, for example GoldService, and in this case it is the CN of a verified, valid certificate.
distinct将检验节点集以查找拥有相同字符串值的节点，并且只保留每个节点的一个实例，而将其余都删除。
Set: distinct examines a node set for nodes with the same string value and removes all but one instance of each.
错误：当把检验时间格式化为一个字符类型时。
一个字节通常有8位，代表一个字符，而第9位是用来检验错误的。
A byte commonly contains 8 bits to represent a single character, and the ninth bit is used for error detection.
也就是 说，实际上在检验字符串长度的顶层代码中你没有花太多开销。
This means you have virtually no overhead on top of the actual code that determines the string's length.
当操作字符串并需要检验其长度是否满足某种要求时，你想当然地会使用strlen函数。
When working with strings and you need to check that the string is either of a certain length you'd understandably would want to use the strlen function.
当操作字符串并需要检验其长度是否满足某种要求时，你想当然地会使用strlen函数。
When working with strings and you need to check that the string is either of a certain length you'd understandably would want to use the strlen function.
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