★

-----------------------------------------------
    외부문서
----------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE booklist SYSTEM "bml.dtd">

<booklist>
    <book>xml 잘하기</book>
    <book>xml 완벽가이드</book>
    <book>xml 바이블</book>
</booklist>
-----------------------------------------------
    내부문서
----------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE booklist [
<!ELEMENT booklist (book+)>
<!ELEMENT book (#PCDATA)>
]>

<booklist>
    <book>xml 잘하기</book>
    <book>xml 완벽가이드</book>
    <book>xml 바이블</book>
</booklist>