XML Schema 1.1 is bringing in the notion of constraints into XML Schema through assertions within data types but without message customization.

XML Schema 1.1通过数据类型内的断言将约束的概念带入了XML Schema，不过，不能进行消息定制。

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Medical workers in Haiti are now trying to spread the message not to use river water without some form of purification.

VOA: special.2010.11.10

Apple never releases a new product without framing the message in one short sentence, always well within 140 characters.

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For decades, we've heard that "screening saves lives" without any accompanying message that there might be reasons not to be screened.

WSJ: Should All Women Over 40 Get Annual Mammograms?

Because without that underlying message and PR tactic, the ad is nonsensical.

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