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简答题 下面的文件正确吗?为什么?用IE和本章中的解析器验证你的结论。 mes.dtd <!ELEMENT message ANY> <!ELEMENT persion (name,age?,lxfs)> <!ELEMENT lxfs (#PCDATA,tel|email)*> <!ELEMENT name (first,last)> <!ATTLIST name sex (male|female) "male"> <!ELEMENT first %pc; > <!ELEMENT last %pc;> <!ELEMENT age %pc;> <!ELEMENT tel %pc;> <!ELEMENT email %pc;> <!ENTITY % pc “(#PCDATA)”> <!ELEMENT emergency EMPTY> <!ATTLIST emergency fire CDATA #FIXED "119" police CDATA #FIXED "110" hospital CDATA #FIXED "120" > mes.xml <?xml version="1.0" encoding="gb2312"?> <!DOCTYPE SYSTEM "mes.dtd"> <message> <persion> <name sex="男"> <first>li</first> <last>xiao</last> </name> <age>25</age> <lxfs> <tel>123456</tel> </lxfs> </persion> <persion> <name> <first>wang</first> <last>xiao</last> </name> <lxfs></lxfs> </persion> <emergency fire="120" police="110" /> </message>
  • 不正确。有5处错误,“<!ELEMENT lxfs (#PCDATA,tel|email)*>”句“#PCDATA”与“tel”之间应该用“|”,或去掉“#PCDATA”;参数实体应先声明后使用;文档类型声明缺少根元素;“name”的“sex”属性取值错误;“emergency”的“fire”属性取值错误。正确的文件:mes.dtd <!ELEMENT message ANY>
    <!ELEMENT persion (name,age?,lxfs)>
    <!ELEMENT lxfs (#PCDATA|tel|email)*>
    <!ELEMENT name (first,last)>
    <!ATTLIST name sex (male|female) "male">
    <!ENTITY % pc "(#PCDATA)">
    <!ELEMENT first %pc; >
    <!ELEMENT last %pc;>
    <!ELEMENT age %pc;>
    <!ELEMENT tel %pc;>
    <!ELEMENT email %pc;>
    <!ELEMENT emergency EMPTY>
    <!ATTLIST emergency
    fire CDATA #FIXED "119"
    police CDATA #FIXED "110"
    hospital CDATA #FIXED "120"

    mes.xml
    <?xml version="1.0" encoding="gb2312"?>
    <!DOCTYPE message SYSTEM "mes.dtd">
    <message>
    <persion>
    <name sex="male">
    <first>li</first>
    <last>xiao</last>
    </name>
    <age>25</age>
    <lxfs>
    <tel>123456</tel>
    </lxfs>
    </persion>
    <persion>
    <name>
    <first>wang</first>
    <last>xiao</last>
    </name>
    <lxfs></lxfs>
    </persion>
    <emergency fire="119" police="110" />
    </message>
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