ciao a tutti.
ho la seguente pagina:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="it" xml:lang="it">


<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />



<style type="text/css">
@import url("emptystyle.css");
</style>
<script type="text/javascript" src="func.js"></script>
</head>



<body>

<form id="form1" action="default.php" method="get"/>

<div id="corpo">
<div id="testata">
[img]testata.gif[/img]
</div>
<div id="menu">
<ul class='navlist'>[*]
Ricerca
[*]
<input type='text' name='testoricerca' id='testoricerca'/>
[*]
<input type="button" value="cerca" onclick="document.form1.action='RicercaEmpty.php'; document.form1.submit();" />[/list]
</div>

<div id="pagina">
<div style="POSITION: absolute;cursorointer; left:103px;top:66px;width:257px;height:2
07px;" />ppppppppppp pppppppppp</div><input type="hidden" name="azione" value="xx" />
<input type="hidden" name="frame" value="0" />
<input type="hidden" name="galleria" value="default" />
<input type="hidden" name="galleriadett" value="pc" />
</div>
<div id="extra">
</div>
<div id="empty">
this was an emptypage
| <a href="http://validator.w3.org/check?uri=http://www.filipposilvestro.com">xhtml
1.0</a> | <a href="http://jigsaw.w3.org/css-validator/validator?uri=http://www.filipposilvestro.com/galleriaArte.css">
css 2.0 </a>

</div>
</body>
</html>
e validandola in xhtml strict mi da' il seguente errore:
Line 16, column 6: end tag for "head" which is not finished

</head>

Most likely, You nested tags and closed them in the wrong order. For example

[i]...</p> is not acceptable, as [i] must be closed before

. Acceptable nesting is:

...</p>

Another possibility is that you used an element (e.g. 'ul') which requires a child element (e.g. 'li') that you did not include. Hence the parent element is "not finished", not complete.
mi date una mano?