当有问题出现显示错误信息，便于调试。
Set the debug option to enable a backtrace when a; problem occurs.
但是在对小型文档进行试验时，几乎是立刻显示错误信息。
In my experiments with small documents, however, it errors out almost immediately.
Zend_Form 能够完成复杂的验证并在表单验证失败时在表单中显示错误信息。
Zend_Form is capable of performing complex validation and displaying error messages on your form when validation fails.
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