XML数据库文档使用PYX

<?xml version="1.0"?>

<!DOCTYPE books SYSTEM "books.dtd">

<books>

  <book isbn="0316769533" date="1951-06">

    <title>Catcher in the Rye</title>

    <author>Jerome David Salinger</author>

    <publisher>Little Brown &amp; Company</publisher>

  </book>

  <book isbn="0446310786" date="1988-10">

    <title>To Kill a Mockingbird</title>

    <author>Harper Lee</author>

    <publisher>Little Brown &amp; Company</publisher>

  </book>

</books> 



And the associated DTD, books.dtd: 



<!ELEMENT books (book*)>

<!ELEMENT book (title,author,publisher)>

<!ATTLIST book  isbn CDATA #REQUIRED date CDATA #IMPLIED>

<!ELEMENT title (#PCDATA)>

<!ELEMENT author (#PCDATA)>

<!ELEMENT publisher (#PCDATA)>