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Com DTD como validar XHTML
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Um original de XHTML é validado de encontro a um Document type definition (DTD). Um DTD apropriado deve ser adicionado como a primeira linha da lima, antes de validar corretamente uma lima de XHTML.
O DTD estrito inclui todos os elementos non-deprecados e atributos ou aqueles que o donot parece nos framesets:
!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
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The Transitional DTDcontains everything which the strict DTD includes
plus deprecated elements and attributes:
!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
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The Frameset DTD includes frames and all the
other things which are included in transitional DTD:
!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Frameset//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd"
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This is a simple XHTML document:
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" >
<html>
<head>
<title>simple document</title>
</head>
<body>
<p>a simple paragraph</p>
</body>
</html>
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