Ciao,
ho un problemino a validare un documento XHTML con la DTD Transitional.

Il validatore mi dā questo messaggio:

"Potential Issues

The following missing or conflicting information caused the validator to perform guesswork prior to validation. If the guess or fallback is incorrect, it may make validation results entirely incoherent. It is highly recommended to check these potential issues, and, if necessary, fix them and re-validate the document.

1.

Warning DOCTYPE Override in effect!

The detected DOCTYPE Declaration "<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">" has been suppressed and the DOCTYPE for "XHTML 1.0 Transitional" inserted instead, but even if no errors are shown below the document will not be Valid until you update it to reflect this new DOCTYPE.

Congratulations

The uploaded document "index.html" was checked and found to be tentatively valid XHTML 1.0 Transitional. This means that with the use of some fallback or override mechanism, we successfully performed a formal validation using an SGML or XML Parser. In other words, the document would validate as XHTML 1.0 Transitional if you changed the markup to match the changes we have performed automatically, but it will not be valid until you make these changes.
Validating CSS Style Sheets

If you use CSS in your document, you can check it for validity using the W3C CSS Validation Service. "

Che significa? cos'č che non vā?

Il mio codice XHTML č il seguente:

codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="it" lang="it">
<head>
<title>Layout 38</title>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1"></meta>
<meta name="generator" content="HAPedit 3.1"></meta>
<link href="layout.css" rel="stylesheet" type="text/css" title="default" />

	<script type="text/javascript" src="sdmenu/sdmenu.js">
		/***********************************************
		* Slashdot Menu script- By DimX
		* Submitted to Dynamic Drive DHTML code library: http://www.dynamicdrive.com
		* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
		***********************************************/
	</script>
	<script type="text/javascript">
	// <![CDATA[
	var myMenu;
	window.onload = function() {
		myMenu = new SDMenu("my_menu");
		myMenu.init();
	};
	// ]]>
	</script>

</head>
<body>
<div id="container">
   
   <div id="header">
     <div id="logo"></div>
     <div id="foto"></div>
   
   </div>
  
   <div id="breadcrumb">
      Home <span>&gt;</span>
      Chi Siamo <span>&gt;</span>
      Corsi Sub <span>&gt;</span>
      Photo Gallery <span>&gt;</span>
      Links <span>&gt;</span>
      Contatti <span>&gt;</span>
      Navigazione Rapida
  </div>
   
   <div id="wrapper">
      <div id="content">
         

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       </div>
    </div>

    <div id="colonnasx">
    <div id="my_menu" class="sdmenu">
      
      <div>
        <span>Home</span>
      </div>
      
      <div class="collapsed">
        <span>Chi Siamo</span>
        Staff
        Dove Siamo
        Il Nostro Diving
      </div>

      <div class="collapsed">
        <span>Corsi Sub</span>
        Open Water Diver
        Advanced OWD
        EFR
        Rescue Diver
        Specialitā
        MasterScubaDiver
        DiveMaster
        HSA Open Water Diver
        Riabilitazione in acqua
        Nuoto Diversamente Abili
        Assistente Bagnanti FIN
     </div>
     
     <div class="collapsed">
        <span>Photo Gallery</span>
        Punti d'Immersione
        Viaggi
        Video
        Eventi
        Corsi
     </div>
     
     <div class="collapsed">
        <span>Links</span>
        HSA Italia
        A.S.S.O.
        Lazio Handicap
        Blu Production
        La Placa
        Juventus Nuoto
    </div>
    
    <div>
       <span>Contatti</span>
    </div>
  
   </div>
   
   <div id="calendario">
     <applet code="ccalendar.class" name="ccalendar" archive="ccalendar/ccalendar.jar" id="cal" height="160"     width="150"><param name="fdw" value="1"></param><param name="color_fond" value="28457F"></param><param name="color_full" value="FF0000"></param><param name="color_case" value="70B9FD"></param><param name="color_Comment" value="61A9DD"></param><param name="color_empty" value="3C5993"></param><param name="field" value="DateField"></param><param name="form" value="DateForm"></param><param name="day1" value="Domenica"></param><param name="day2" value="Lunedi"></param><param name="day3" value="Martedi"></param><param name="day4" value="Mercoledi"></param><param name="day5" value="Giovedi"></param><param name="day6" value="Venerdi"></param><param name="day7" value="Sabato"></param><param name="month1" value="Gennaio"></param><param name="month2" value="Febbraio"></param><param name="month3" value="Marzo"></param><param name="month4" value="Aprile"></param><param name="month5" value="Maggio"></param><param name="month6" value="Giugno"></param><param name="month7" value="Luglio"></param><param name="month8" value="Agosto"></param><param name="month9" value="Settembre"></param><param name="month10" value="Ottobre"></param><param name="month11" value="Novembre"></param><param name="month12" value="Dicembre"></param><param name="etarget" value="_new"></param><param name="event_file" value="./ccalendar/example.txt"></param><param name="sched_file" value="./schedule.txt"></param></applet>     
   
   </div>
</div>


    <div id="extra">
        [img]img/marchi/padi.jpg[/img]</img>
        [img]img/marchi/nadd.jpg[/img]</img>
        [img]img/marchi/awarelogo.jpg[/img]</img>
        [img]img/marchi/hsaijpg.jpg[/img]</img>
  </div>
   
   <div id="footer">

Here it goes the footer</p></div>

</div>
</body>
</html>
Grazie
Andrea