Can contain the value null and use database semantics for evaluating nulls 可包含null值并可使用數(shù)據(jù)庫(kù)語(yǔ)義計(jì)算null值。
If xml semantics or database semantics show up in your code , then you ve probably got a data binding api that is poorly written , poorly implemented , or both 如果在代碼中暴露xml語(yǔ)義和數(shù)據(jù)庫(kù)語(yǔ)義,就可能得到編寫很差、實(shí)現(xiàn)很差或者兩者都很差的數(shù)據(jù)綁定api 。