must be valid

基本解釋

Furthermore, it defines a special QName data type for strings that must be valid as qualified names.
而且，它為必須是有效限定名的字符串定義了一個專門的 QName 數據類型。
DB2 UDB does not allow MAXVALUE to be followed by any other values, and the range must be valid for each partition value.
DB2 UDB 不允許 MAXVALUE 后面跟上任何其他值，每個分區(qū)值的范圍必須有效。
For the element message to be valid, its content must be valid as defined by its complexType definition and all assertions must evaluate to true.
要使 message 元素有效，其內容必須按照 complexType 定義那樣定義為有效內容，并且所有斷言的值必須為 true。

What must this experiment have the potential to do, to be a valid scientific experiment?
實驗必須有做什么的能力,才能被稱為一個有效的科學實驗呢？
麻省理工公開課 - 計算機科學及編程導論課程節(jié)選

The ruling says that 1.1 million signatures might be valid but must be verified by the signers.
CENTERFORSECURITYPOLICY: Hemispheric security watch
What is more, the Parliament is engaged in predictable manuevers to dilute the effect of the referendum by adding questions to the ballot — thereby deliberately confusing the outcome and by requiring that at least 50 percent of registered voters must participate in order for it to be judged valid.
CENTERFORSECURITYPOLICY: Freedom Flame 2013