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XHTML: Document Type Definitions
TRANSISITONAL
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" SYSTEM "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
STRICT
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" SYSTEM "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" >
FRAMESET
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" SYSTEM "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd" >