Required-entry validation is frequently used in conjunction with other types of validation.
必需项的验证经常和其他类型的验证结合使用。
There are actually two types of validation error messages - those generated before the HTML form fields are bound to a class and those generated after the form fields are bound to the class.
实际上有两种错误消息类型：在捆绑html表单的时候根据类型生成的，和提交后表单元素绑定的类生成的。
In this section, we'll introduce different types of schema changes with respect to validation.
这一节介绍和验证有关的不同的模式变动类型。
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