个XML文档 其中的book.dtd为 <! elemenT book (title, author*, price)> K!ARRLIST BOOK year CDATA #REQUIRED> <!eLemENT title (#PCDATA)> <! ELEMENT author (firstname, lastname)> <! ELEMENT firstname(#PCDATA)> ELEMENT lastname(#PCDATA)> <! ELEMENT price (#PCDATA)>一个XML文档 其中的book.dtd为: <!ELEMENT book (title,author*,price)> <!ARRLIST BOOK year CDATA #REQUIRED> <!ELEMENT title (#PCDATA)> <!ELEMENT author (firstname,lastname)> <!ELEMENT firstname (#PCDATA)> <!ELEMENT lastname (#PCDATA)> <!ELEMENT price (#PCDATA)>