【正文】
successor of DTDs, is XML Schema, often referred to by the initialism for XML Schema instances, XSD (XML Schema Definition). XSDs are far more powerful than DTDs in describing XML languages. They use a rich datatyping system and allow for more detailed constraints on an XML document39。單擊此處編輯主標(biāo)題 單擊此處編輯副標(biāo)題 單擊此處編輯標(biāo)題 ? 正文部分樣例 A ? 正