Question

我通过w3schools验证器运行我的XML / DTD它告诉我它有很多错误，我做错了什么？我承认自从我使用XML

以来已经有几年了

<?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>

Answer 1

请注意，您的XML文档 格式正确 ，但无效。您可以阅读the difference between well-formed and invalid here。

要使您的XML有效：

更改WEBDESIGNTOPICS的内容模型以反映这一事实它显然只是topics的列表：
```
 <!ELEMENT WEBDESIGNTOPICS (topic+)>
```
更改主题的内容模型以反映它可以包含的内容模型一个或多个topicname，description和provided元素。您必须确定作为样本的必要性和基数 XML不能表明一般性：
```
<!ELEMENT topic (topicname,description,provided)>
```

然后，这个更新的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>

格式良好的XML DTD

1 个答案: