Question

嘿伙计们我有一个外部的XML DTD代码但是当我尝试验证它时，我似乎得到了一个错误。我的代码如下：

<!DOCTYPE catalog [ 
    <!ELEMENT catalog (book)+>
    <!ELEMENT book (title, authors, year_published, ISBN, number_of_pages, price) >
    <!ELEMENT title (#PCDATA)>
    <!ELEMENT authors (author)>
    <!ELEMENT author (first_name, last_name, gender)>
        <!ELEMENT first_name (#PCDATA)>
        <!ELEMENT last_name (#PCDATA)>
        <!ELEMENT gender (#PCDATA)>
    <!ELEMENT year_pusblished (#PCDATA)>
    <!ELEMENT ISBN (#PCDATA)>
    <!ELEMENT number_of_pages (#PCDATA)>
    <!ELEMENT price (discount)>
        <!ATTLIST price discount (yes|no) "no">]>

我知道一切都是正确的但是当我验证它时会出现错误消息：

“文档类型声明中包含或指向的标记声明必须格式正确。第3行第4列”

我已经检查了一切，但我似乎无法让它工作。你们能帮忙吗？

Answer 1

如果你写入文件.xml你没有生成错误，但如果你有.dtd文件，你必须清除该元素！正确的文件test.xml：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE catalog [ 
<!ELEMENT catalog (book)+>
<!ELEMENT book (title, authors, year_published, ISBN, number_of_pages, price) >
<!ELEMENT title (#PCDATA)>
<!ELEMENT authors (author)>
<!ELEMENT author (first_name, last_name, gender)>
<!ELEMENT first_name (#PCDATA)>
<!ELEMENT last_name (#PCDATA)>
<!ELEMENT gender (#PCDATA)>
<!ELEMENT year_pusblished (#PCDATA)>
<!ELEMENT ISBN (#PCDATA)>
<!ELEMENT number_of_pages (#PCDATA)>
<!ELEMENT price (discount)>
<!ATTLIST price discount (yes|no) "no">]>
<catalog>
    <book>
        <title></title>
        <authors>
            <author>
                <first_name></first_name>
                <last_name></last_name>
                <gender></gender>
            </author>
        </authors>
        <year_published></year_published>
        <ISBN></ISBN>
        <number_of_pages></number_of_pages>
        <price>
            <discount></discount>
        </price>
    </book>
</catalog>

更正文件test.dtd（链接到xml文件，声明到同一个test.xml）：

<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT catalog (book)+>
<!ELEMENT book (title, authors, year_published, ISBN, number_of_pages, price) >
<!ELEMENT title (#PCDATA)>
<!ELEMENT authors (author)>
<!ELEMENT author (first_name, last_name, gender)>
<!ELEMENT first_name (#PCDATA)>
<!ELEMENT last_name (#PCDATA)>
<!ELEMENT gender (#PCDATA)>
<!ELEMENT year_pusblished (#PCDATA)>
<!ELEMENT ISBN (#PCDATA)>
<!ELEMENT number_of_pages (#PCDATA)>
<!ELEMENT price (discount)>
<!ATTLIST price discount (yes|no) "no">

DTD元素帮助

1 个答案: