When I took the stage to do my demo, I looked at my laptop and promptly saw a message from our IBM security utility about a policy violation for disabling my screensaver.
For example, when a constraint is violated, you might want to provide a link from the informative message to the field that is primarily responsible for the violation.
例如，当违反条件时，可能希望在信息性消息中提供违反条件的字段的链接。
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The error message can also use XPaths to refer to values in the instance being validated to provide more information about what is causing the violation.