java - XML错误: Open quote is expected for attribute id associated with an element type

Question

我正在尝试解析如下所示的 XML 文件:

<?xml version="1.0"?>
<!DOCTYPE COUNTRIES_CONTINENT PUBLIC 
           "-//XYZ//DTD Declarations(CountriesContinent)//EN" "dtds/countries_continent.dtd">
<COUNTRIES_CONTINENT>
   <CONTINENT id="6" name="Oceania" value="12">
       <COUNTRY name="Argentina"/>
       <COUNTRY name="Bolivia"/>
       <COUNTRY name="Brazil"/>
       <COUNTRY name="Chile"/>
        <COUNTRY name="Colombia"/>
        <COUNTRY name="Ecuador"/>
        <COUNTRY name="Guyana"/>
        <COUNTRY name="Paraguay"/>
        <COUNTRY name="Peru"/>
        <COUNTRY name="Suriname"/>
        <COUNTRY name="Uruguay"/>
        <COUNTRY name="Venezuela"/>
    </CONTINENT>
</COUNTRIES_CONTINENT>

具有以下 DTD 文件:

<!ELEMENT COUNTRIES_CONTINENT (CONTINENT+)>
<!ELEMENT CONTINENT (COUNTRY+)>
<!ELEMENT COUNTRY EMPTY>
<!ATTLIST CONTINENT id  CDATA  ID #REQUIRED>
<!ATTLIST CONTINENT name  CDATA #REQUIRED>
<!ATTLIST CONTINENT value CDATA #REQUIRED>
<!ATTLIST COUNTRY   name CDATA #REQUIRED>

我遇到以下异常:

Open quote is expected for the attribute "id" associated with an element type "CONTINENT".

谁能指出出了什么问题吗？

Answer 1

<!ATTLIST CONTINENT id  CDATA  ID #REQUIRED>

属性类型可以是CDATA 或ID，但不能同时是两者。这些类型中的每一种都有其自己的规则，描述它们允许包含的值的范围。请检查您期望的 id 类型。

参见http://www.w3schools.com/xml/xml_dtd_attributes.asp