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<!-- bookstore.dtd — external DTD file --> <!-- (this content would live in bookstore.dtd) --> <!-- <!ELEMENT bookstore (book+)> <!ELEMENT book (title, author, year, isbn)> <!ELEMENT title (#PCDATA)> <!ELEMENT author (#PCDATA)> <!ELEMENT year (#PCDATA)> <!ELEMENT isbn (#PCDATA)> <!ATTLIST book id ID #REQUIRED lang NMTOKEN "en"> <!ENTITY publisher "Acme Press"> <!ENTITY addr "123 Book Lane, Reading, RG1 1AA"> --> <!-- ——— XML instance file referencing external DTD ——— --> <?xml version="1.0" encoding="UTF-8"?> <!-- PUBLIC identifier + SYSTEM fallback --> <!DOCTYPE bookstore PUBLIC "-//AcmePress//DTD Bookstore 1.0//EN" "http://example.com/dtd/bookstore.dtd"> <!-- Inline internal subset that adds/overrides entities and can coexist with external DTD --> <!DOCTYPE bookstore SYSTEM "bookstore.dtd" [ <!ENTITY publisher "Acme Press"> <!ENTITY addr "123 Book Lane"> <!-- Parameter entity: reuse in content models --> <!ENTITY % textContent "(#PCDATA)"> <!ELEMENT note %textContent;> ]> <bookstore> <book id="b001" lang="en"> <title>XML Essentials</title> <author>Jane Author</author> <year>2024</year> <isbn>978-0-000-00000-0</isbn> </book> <!-- Using the general entity --> <note>Published by &publisher; at &addr;.</note> </bookstore>
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