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The DOCTYPE definition specifies the document type: <!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
""> The rest of the document looks like HTML: <html>
<title>simple document</title>
<p>a simple paragraph</p>
</html> Document Type Definitions DTD specifies the syntax of a web page in SGML. DTD is used by SGML applications, such as HTML, to specify rules that apply to the markup of
documents of a particular type, including a set of element and entity declarations. XHTML is specified in an SGML document type definition or 'DTD'. An XHTML DTD describes in precise, computer-readable language the allowed syntax and
grammar of XHTML markup. Validating an XHTML document's content involves checking its markup against a DTD and reporting
markup errors. There are currently 3 XHTML document types: STRICT TRANSITIONAL FRAMESET XHTML 1.0 specifies three XML document types that correspond to the three HTML 4.0 DTDs: Strict,
Transitional, and Frameset. XHTML 1.0 Strict <!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
""> Use this when you want really clean markup, free of presentational clutter. Use this together with Cascading
Style Sheets. XHTML 1.0 Transitional <!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"