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XHTML : eXtensible HyperText Markup Language
XML : eXtensible Markup Language
XSL : eXtensible Style Sheets
★ 표준 문서 구조
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns=http://www.w3.org/1999/xhtml xml:lang="ko-KR">
<head>
<title></title>
</head>
<body>
</body>
</html>
<html xmlns=http://www.w3.org/1999/xhtml xml:lang="ko-KR">
<head>
<title></title>
</head>
<body>
</body>
</html>