The is validated predicate returns true if the document is already validated against the specified schema and returns false otherwise.
如果已经根据指定的模式验证了文档，IS VALIDATED谓词将返回true，否则返回错误。
Once the predicate returns false, it stops taking from the sequence.
一旦断言返回false，它就停止从这个序列中获取。
This is because, for a given row, the XMLEXISTS predicate evaluates to false only if the XQuery expression inside returns the empty sequence.
这是因为，对于一个给定的行，只有当里面的XQuery表达式返回空序列时，XMLEXISTS谓词才为false。
The is validated predicate returns true if the XML document is already validated against any specific schema or against any registered schemas, else it will return false.
如果已经根据特定的模式或任何已注册模式验证了XML文档，IS VALIDATED谓词将返回true，否则返回false。
The is not validated predicate returns true if the XML document is not validated against specified schema or any of the registered schemas, or else it will return false.
如果还没有根据特定的模式或任何已注册模式验证了XML文档，IS NOT VALIDATED谓词将返回true，否则返回false。
Words are separated by hyphens, and the function's name ends with a question mark, indicating it is a predicate in that it returns true or false.
单词均以连字符分隔，并且此函数的名字是以一个问号结尾的，用以表示此函数是一个断言，因它会返回true或 false。
Predicate is another common form of query expression that evaluates to either true or false.
Predicate是计算结果为true或false的常见查询表达式形式。
Predicate, which evaluates to a Boolean value of true or false. (in fact, it is declared as interface Predicate extends Expression.)
其计算为布尔值true或false(事实上，它被声明为interfacePredicateextends Expression)。
Predicate, which evaluates to a Boolean value of true or false. (in fact, it is declared as interface Predicate extends Expression.)
其计算为布尔值true或false(事实上，它被声明为interfacePredicateextends Expression)。
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