格式良好的XML DTD

我通过W3Validator运行了我的XML/DTD，它告诉我它有错误分配，我做错了什么？我承认我已经有几年没有使用XML了

<?xml version="1.0" encoding="iso-8859-1" standalone="yes"?>
<!DOCTYPE WEBDESIGNTOPICS [
<!ELEMENT WEBDESIGNTOPICS (topic+,topicname+,description+,provided)>
<!ELEMENT topic (#PCDATA)>
<!ELEMENT topicname (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT provided (#PCDATA)>
]>
<WEBDESIGNTOPICS>
<topic>
    <topicname>HTML5</topicname>
    <description>HAMILTON</description>
    <provided>SALESMAN</provided>

</topic>
<topic>
    <topicname>CSS/CSS3</topicname>
    <description>SMITH</description>
    <provided>CLEANER</provided>

</topic>
<topic>
    <topicname>PHP</topicname>
    <description>JONES</description>
    <provided>MANAGER</provided>
</topic>
<topic>
    <topicname>JavaScript</topicname>
    <description>JONES</description>
    <provided>MANAGER</provided>
</topic>
<topic>
    <topicname>jQuery</topicname>
    <description>JONES</description>
    <provided>MANAGER</provided>
</topic>
</WEBDESIGNTOPICS>

]>
HTML5
汉密尔顿
推销员
CSS/CSS3
史密斯
清洁工
PHP
琼斯
经理
JavaScript
琼斯
经理
jQuery
琼斯
经理

请注意，您的XML文档格式良好，但无效。你可以读到

要使XML有效，请执行以下操作：

<?xml version="1.0" encoding="iso-8859-1" standalone="yes"?>
<!DOCTYPE WEBDESIGNTOPICS [
<!ELEMENT WEBDESIGNTOPICS (topic+)>
<!ELEMENT topic (topicname,description,provided)>
<!ELEMENT topicname (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT provided (#PCDATA)>
]>
<WEBDESIGNTOPICS>
    <topic>
        <topicname>HTML5</topicname>
        <description>HAMILTON</description>
        <provided>SALESMAN</provided>
    </topic>
    <topic>
        <topicname>CSS/CSS3</topicname>
        <description>SMITH</description>
        <provided>CLEANER</provided>
    </topic>
    <topic>
        <topicname>PHP</topicname>
        <description>JONES</description>
        <provided>MANAGER</provided>
    </topic>
    <topic>
        <topicname>JavaScript</topicname>
        <description>JONES</description>
        <provided>MANAGER</provided>
    </topic>
    <topic>
        <topicname>jQuery</topicname>
        <description>JONES</description>
        <provided>MANAGER</provided>
    </topic>
</WEBDESIGNTOPICS>

更改

WEBDESIGNTOPICS

的内容模型以反映事实 这显然只是一个

主题列表

：

 <!ELEMENT WEBDESIGNTOPICS (topic+)>

总之，此更新的XML文档将是有效的：

<?xml version="1.0" encoding="iso-8859-1" standalone="yes"?>
<!DOCTYPE WEBDESIGNTOPICS [
<!ELEMENT WEBDESIGNTOPICS (topic+)>
<!ELEMENT topic (topicname,description,provided)>
<!ELEMENT topicname (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT provided (#PCDATA)>
]>
<WEBDESIGNTOPICS>
    <topic>
        <topicname>HTML5</topicname>
        <description>HAMILTON</description>
        <provided>SALESMAN</provided>
    </topic>
    <topic>
        <topicname>CSS/CSS3</topicname>
        <description>SMITH</description>
        <provided>CLEANER</provided>
    </topic>
    <topic>
        <topicname>PHP</topicname>
        <description>JONES</description>
        <provided>MANAGER</provided>
    </topic>
    <topic>
        <topicname>JavaScript</topicname>
        <description>JONES</description>
        <provided>MANAGER</provided>
    </topic>
    <topic>
        <topicname>jQuery</topicname>
        <description>JONES</description>
        <provided>MANAGER</provided>
    </topic>
</WEBDESIGNTOPICS>

]>
HTML5
汉密尔顿
推销员
CSS/CSS3
史密斯
清洁工
PHP
琼斯
经理
JavaScript
琼斯
经理
jQuery
琼斯
经理