Type definition in XML page with XML Schema

[chobin]

Hi all.
I've a terrible question.
I've to build one XML page (based on a xml schema) that implements a
dynamic database. In particular, I would declare something like this:

<?xml version="1.0" encoding="UTF-8"?>
<virtuose xmlns="http://www.virtuose.it/ns/virtuose"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.virtuose.it/ns/virtuose
F:\Tesi\virtuose_1.1.xsd">

<conferenza allowedMessagesTypes="t1" cid="c1" system="true">
<nome>tipimsg</nome>
<hook></hook>
<messages>
<message mid="t1" uid="u1" type="t1"></message>
<message mid="t2" uid="u1" type="t1">
<t2:schema>
<t2:element name="utente">
<t2:complexType>
<t2:sequence>
<t2:element name="autenticazione">
<t2:complexType>
<t2:sequence>
<t2:element name="login" type="string"/>
<t2:element name="password" type="string"/>
<t2:element name="configurazione" type="stringa"/>
</t2:sequence>
</t2:complexType>
</t2:element>
<t2:element name="anagrafica">
<t2:complexType>
<t2:sequence>
<t2:element name="nome" type="string"/>
<t2:element name="cognome" type="string"/>
<t2:element name="codfisc" type="string"/>
<t2:element name="via" type="string"/>
<t2:element name="comune" type="string"/>
<t2:element name="provincia" type="string"/>
<t2:element name="cap" type="string"/>
<t2:element name="telefono" type="string"/>
<t2:element name="fax" type="string"/>
<t2:element name="cellulare" type="string"/>
<t2:element name="email" type="string"/>
</t2:sequence>
</t2:complexType>
</t2:element>
<t2:element name="profili">
<t2:attribute name="pids" type="IDREF" use="required"/>
</t2:element>
</t2:sequence>
</t2:complexType>
</t2:element>
</t2:schema>
</message>
</messages>
</conferenza>
<conferenza allowedMessagesTypes="t2" cid="c2" system="true">
<nome>utenti</nome>
<hook></hook>
<messages>
<message mid="u1" uid="u1" type="t2">
<t2:utente>
<t2:login>ciccio</t2:login>
<t2:profili></t2:profili>
</t2:utente>
</message>
</messages>
</conferenza>
</virtuose>
So, I've to declare on section <message mid="t2" uid="u1" type="t1">
the type of section

<message mid="u1" uid="u1" type="t2">
<t2:utente>
<t2:login>ciccio</t2:login>
<t2:profili></t2:profili>
</t2:utente>
</message>

but I haven't found in witch way I could include in a XML page a type
declaration made with schema.

I hope my message is not too difficult to read...
I'm sorry but I'm an italian student.

Thank you very much
Cheers

Chobin