Often a constraint message needs to be "customized" in a particular context because what appears to be one constraint is indeed two different constraints applied in different contexts.
一条约束消息需要在特定上下文中“自定义”通常是因为，看似是一个约束的内容，实际上是两个适用于不同上下文的不同约束。
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。
The Message Key is used for display purposes when the constraint fails.
MessageKey用来显示约束失败的情况。
A literal message implies that a schema is utilized to provide a description and constraint for an XML payload in SOAP.
Literal消息表明要使用模式来提供对SOAP中的xml有效负载的描述和约束。
Listing 7 gives the form's source in its entirety, after it has been generated with both the constraint-generation and message-generation options.
清单7给出完整的表单源代码，它是用约束生成和消息生成选项生成的。
Listing 7 gives the form's source in its entirety, after it has been generated with both the constraint-generation and message-generation options.
清单7给出完整的表单源代码，它是用约束生成和消息生成选项生成的。
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