Probelma con XMLValidatingReader

[grandeorco]

Cioa a tutti, seguendo l' esempio del mio libro ho prodotto un file XML con il suo file schema XDR e la pagina aspx per convalidare il mio XML. Seguendo questa via, il libro dice che la pagina aspx non dovrebbe dare nessuna segnalazione di errore ma invece la da ed e questa



Elemento 'Attribute' non supportato in questo contesto.
Line: 2 Position: 12

Elemento 'Attribute' non supportato in questo contesto.
Line: 2 Position: 12

Elemento 'elemnte' non supportato in questo contesto.
Line: 2 Position: 12

Nessuna convalida eseguita.
Line: 35 Position: 13



Ed io non so che fare


il file XML è questo

<?xml version="1.0"?>
<bookstore xmlns="x-schema:books-schema.xdr">
    <book genre="novel" style="hardcover">
        <title>The Handmaid' s Tale</title>
        <price>19.95</price>
        <author>
            <first-name>Margaret</first-name>
            <last-name>Atwood</last-name>
        </author>
    </book>
    <book genre="novel" style="hardcover">
        <title>The Poisonwood Bible</title>
        <price>11.99</price>
        <author>
            <first-name>Barbara</first-name>
            <last-name>Kingsolver</last-name>
        </author>
    </book>
    <book genre="novel" style="hardcover">
        <title>Hannibal</title>
        <price>27.95</price>
        <author>
            <first-name>Richard</first-name>
            <last-name>Harris</last-name>
        </author>
    </book>
    <book genre="novel" style="hardcover">
        <title>Focault' s Pendulum</title>
        <price>22.95</price>
        <author>
            <first-name>Umberto</first-name>
            <last-name>Eco</last-name>
        </author>
    </book>
</bookstore>

il file schema XDR è questo

<?xml version="1.0"?>
<Schema xmlns="urn:schemas-microsoft-com:xml-data"
    xmlns:dt="urn:schemas-microsoft-com:datatypes">
    <ElementType name="first-name" content="textOnly" />
    <ElementType name="last-name" content="textOnly" />
    <ElementType name="name" content="textOnly" />
    <ElementType name="price" content="textOnly"
        dt:type="fixed.14.4" />
    <ElementType name="author" content="eltOnly" order="one">
        <group order="seq">
            <element type="name" />
        </group>
        <group order="seq">
            <element type="first-name" />
            <element type="last-name" />
        </group>
    </ElementType>
    <ElementType name="title" content="textOnly" />
        <AttributeType name="genre" dt:type="string" />
        <AttributeType name="style" dt:type="enumeration"
            dt:values="paperback hardcover" />
    <ElementType name="book" content="eltOnly">
        <Attribute type="genre" required="yes" />
        <Attribute type="style" required="yes" />
        <element type="title" />
        <element type="author" />
        <elemnte type="price" />
     </ElementType>
     <ElementType name="bookstore" content="eltOnly">
        <element type="book" />
     </ElementType>
</Schema>

e la pagina aspx è questa

<%@ Page Language="VB" %>
<%@ Import Namespace="System.Xml" %>
<%@ Import Namespace="System.Xml.Schema" %>

<script runat="server">
    private reader as XMLTextReader
    private validator as XMLValidatingReader
    
    sub Page_Load(obj as object, e as eventargs)
        try
            reader = new XmlTextReader(Server.MapPath _
                ("books2.xml"))
            validator = new XMLValidatingReader(reader)
            validator.ValidationType = ValidationType.XDR
            
            AddHandler Validator.ValidationEventHandler, new _
                ValidationEventHandler(addressof showError)
            
            while validator.Read()
            end while
        catch ex as Exception
            response.write("Error accessing XML file")
        finally
            reader.Close
        end try
    end sub
    sub ShowError(obj as object, e as ValidationEventArgs)
        response.write("<font color=""red"">" & e.Message & _
            "
")
            
        if (reader.LineNumber > 0)
            Response.write("Line: " & reader.LineNumber & _
                " Position: " & reader.LinePosition & _
                "</font>

</p>")
        end if
    end sub
</script>

<html><body>

</body></html> 

Grazie per l' aiuto