schema validation problem (element type element_name must be declared))

[rasco rasco]

hi all, i'm new in this mailing list.
I'm using xerces 1.2.3.

this is my simple schema

<xsd:schema
xmlns:xsd="http://www.w3.org/1999/XMLSchema";
xmlns:per="http://localhost/~devel/per.xsd";
targetNamespace="http://localhost/~devel/per.xsd";>


<xsd:element name="listaNomi">
<xsd:complexType>
 <xsd:sequence>
 <xsd:element ref="per:persona"
maxOccurs="unbounded"/>
 </xsd:sequence>
</xsd:complexType>
</xsd:element>


<xsd:element name="persona">
 <xsd:complexType>
    <xsd:sequence>
     <xsd:element name="nome" type="xsd:string" />
     <xsd:element name="cognome" type="xsd:string" />
    </xsd:sequence>
 </xsd:complexType>
</xsd:element>

</xsd:schema>


and this is my very simple xml file:

<?xml version="1.0"?>
   
<listaNomi
xmlns="http://localhost/~devel/per.xsd";
xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance";
xsi:schemaLocation="http://localhost/~devel/per.xsd 
 http://localhost/~devel/per.xsd";>
      
      <persona>
         <nome>luca</nome>
         <cognome>rasconi</cognome>
      </persona>
</listaNomi>

when i try to validate the xml file, application teel
me that all the element present in the xml document
must be declared.
what's the problem?

thank in advance.

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