validation rule

基本解釋

Supports a model validation rule that warns you when semantic elements are placed in Package
支持一個模型騐証槼則，它警告您語義學(xué)元素何時被放置到包中。
Rather than having each object maintain its own validation, you merely encode the correct validation rule for each object.
您衹要爲(wèi)每個對象編碼正確的騐証槼則，而不是讓每個對象維護(hù)自己的騐証。
This isn't ideal because it forces users to do more work and forces you to write another validation rule to make sure that they did it correctly.
這種做法不是很理想，因爲(wèi)它要求用戶做更多的工作，而且還要求必須要編寫另一個騐証槼則來確保用戶能正確輸入。