It also used somewhat awkward syntax to define the valid XML structure. 它还使用有些拙笨的语法来定义有效的XML结构。
However, some people dislike DTD for its awkward syntax, limitations in the text and markup constructs it can express, and the difficulty of handling XML Namespaces. 但是,一些人不喜欢DTD,因为它丑陋的语法、表达文本和标记结构的局限性,并且难以处理XMLNamespaces。