xml - XPath查询问题

Question

我的XML DTD如下：

<!DOCTYPE Bookstore [
<!ELEMENT Bookstore (Book | Magazine)*>
<!ELEMENT Book (Title, Authors, Remark?)>
<!ATTLIST Book ISBN CDATA #REQUIRED
              Price CDATA #REQUIRED
              Edition CDATA #REQUIRED>
<!ELEMENT Magazine (Title)>
<!ATTLIST Magazine Month CDATA #REQUIRED Year CDATA #REQUIRED> 
<!ELEMENT Title (#PCDATA)>
<!ELEMENT Authors (Author+)>
<!ELEMENT Remark (#PCDATA)>
<!ELEMENT Author (First_Name, Last_Name)>
<!ELEMENT First_Name (#PCDATA)>
<!ELEMENT Last_Name (#PCDATA)>
]>

我想运行以下查询：

Title Book whose title is the same as title of a magazine.

我想不出一种方法来运行此query.Anyone请帮助我，我将感激不尽。

Answer 1

您可以尝试这样的事情：

//Bookstore/Book/Title[. = //Magazine/Title]

在xpath之上，返回所有 <Title>元素，这些元素是 <Book>的子元素，并且其值至少等于 <Title>的一个 <Magazine>。