Question

所以我正在设计一个基于某个DTD的XML文件。因此逻辑是：

Category >> Books(can have many entries) >>Author[required], Price[required], Description, Image)

以下是生成的DTD：

<!ELEMENT CATAGORY (PRODUCT+)>
<!ELEMENT PRODUCT
(NAME,PRICE,DESCRIPTION*,PICTURE*)>
<!ATTLIST PRODUCT
NAME CDATA #REQUIRED
PRICE CDATA #REQUIRED
DESCRIPTION CDATA #IMPLIED
PICTURE CDATA #IMPLIED
CATEGORY (BOOKS|GADGETS|OTHERS) "BOOKS"
AUTHOR CDATA #REQUIRED
ISBN CDATA #IMPLIED
INVENTORY (InStock|Backordered|Discontinued) "InStock">

但是，我无法编写有效的XML。我写道：

<CATAGORY>
    <PRODUCT NAME="XML BOOK" AUTHOR="XML GENIUS" CATEGORY="BOOKS" DESCRIPTION="BRILLIANT XML BOOK."  INVENTORY="InStock" ISBN="653725327" PRICE="36.99" PICTURE=""/>
    <PRODUCT NAME="XML MASTERS" AUTHOR="XML TEACHER" CATEGORY="BOOKS" DESCRIPTION="" INVENTORY="InStock" ISBN="" PICTURE="" PRICE="23.99"/> 
</CATAGORY>

我收到以下错误。任何帮助表示赞赏。

Content model of element <PRODUCT> requires further child elements.
    Error location: CATAGORY / PRODUCT
    Details
        VC: Element Valid (2): Content model of element <PRODUCT> requires further child elements.

Answer 1

PRODUCT的定义，

<!ELEMENT PRODUCT
    (NAME,PRICE,DESCRIPTION*,PICTURE*)>

说，<PRODUCT>必须包含一个<NAME>元素，一个<PRICE>元素，依此类推。但是从ATTLIST和你想要使用属性的示例代码。所以只需将定义更改为

即可

<!ELEMENT PRODUCT EMPTY>

DTD到XML错误

1 个答案: