DTD

HTML is an SGML-DTD, and XHTML is an XML-DTD...

Yes, it's true. Anyone can write a DTD and those document almost looks like HTML....

In the document:
<?xml standalone="no" ?>
<!DOCTYPE paper SYSTEM paper.dtd>
<paper background="black">
<p>A paragraph...</p>
</paper>

In the DTD:
<!ELEMENT paper (p*, #PCDATA)>
<!ELEMENT p (#PCDATA)>
<!ATTRLIST paper
background (black|red|blue|white)
>

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