Validation d'un xml via xsd : Element non déclaré!

bonjour,

je voudrais valider un xml via un schema xsd .

J'ai à chaque fois une erreur concernant l'element racine qui est soit-disant non déclaré, si vous pouviez m'éclairer parce que la je tourne en rond et je ne trouve pas :

voila mon code :

Code:

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string   s  ="<?xml version='1.0' encoding='UTF-8'?>";
          s +="<query>";
          s +="<doctypes>";
          s +="  <doctype Id='IDs'/> ";
          s +="</doctypes>";
          s +="<params>";
          s +="  <wordparam FieldId='xCollec'>";
          s +="      <expression> mon expression </expression>";
          s +="  </wordparam>";
          s +="  <dateparam FieldId='iDate'>";
          s +="      <from>2008-01-01</from>";
          s +="      <to>2008-01-31</to>";
          s +="  </dateparam>";
          s += "  <stringparam FieldId='iRef'>";
          s +="      <value></value>";
          s += "  </stringparam>";
          s +="</params>";
          s += "<orderby FieldId='iDate' Option='descending'/>";
          s +="</query>";
 
//chargement du schema xml
                XmlSchema xSchema = new XmlSchema();
                xSchema.SourceUri = Context.Server.MapPath("~/searchParams.xsd");
 
                XmlReaderSettings xSettings = new XmlReaderSettings();
                xSettings.IgnoreComments = true;
                xSettings.IgnoreWhitespace = true;
                xSettings.Schemas.Add(xSchema);
                xSettings.ValidationType = ValidationType.Schema;
                xSettings.ValidationEventHandler += new ValidationEventHandler(ValidationCallback);
 
                XmlReader xReader = XmlReader.Create(new StringReader(s), xSettings);
                while (xReader.Read()) {}
                xReader.Close();
 
 
            private static void ValidationCallback(Object sender, ValidationEventArgs args)
            {
                if (sXmlValidationErrors != string.Empty) sXmlValidationErrors += "|";
                sXmlValidationErrors += args.Message;
            }

voici le xsd :

Code:

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<?xml version="1.0" encoding="utf-8" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 
  <!-- ATTRIBUTS -->
  <xs:attribute name="Id"      type="xs:string"/>
  <xs:attribute name="FieldId" type="xs:string"/>
  <xs:attribute name="Option"  type="xs:string"/>
 
  <!-- SIMPLE ELEMENTS -->
  <xs:element name="expression" type="xs:string"/>
  <xs:element name="from"       type="xs:date"/>
  <xs:element name="to"         type="xs:date"/>
  <xs:element name="From"       type="xs:time"/>
  <xs:element name="To"         type="xs:time"/>
  <xs:element name="value"      type="xs:string"/>
 
 
  <!-- EMPTY ELEMENTS  LVL 2-->
  <xs:element name="doctype">
    <xs:complexType>
      <xs:attribute ref="Id" use="required"/>
    </xs:complexType>
  </xs:element>
 
  <!-- EMPTY ELEMENTS  LVL 1-->
  <xs:element name="orderby">
    <xs:complexType>
      <xs:attribute ref="FieldId" use="required"/>
      <xs:attribute ref="Option" use="required"/>
    </xs:complexType>
  </xs:element>
 
  <!-- COMPLEX ELEMENTS LVL 2 -->
  <xs:element name="wordparam">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="expression"/>
      </xs:sequence>
      <xs:attribute ref="FieldId" use="required"/>
    </xs:complexType>
  </xs:element>
 
  <xs:element name="csvparam">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="value"/>
      </xs:sequence>
      <xs:attribute ref="FieldId" use="required"/>
    </xs:complexType>
  </xs:element>
 
  <xs:element name="stringparam">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="value"/>
      </xs:sequence>
      <xs:attribute ref="FieldId" use="required"/>
    </xs:complexType>
  </xs:element>
 
  <xs:element name="dateparam">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="from"/>
        <xs:element ref="to"/>
      </xs:sequence>
      <xs:attribute ref="FieldId" use="required"/>
    </xs:complexType>
  </xs:element>
 
  <xs:element name="timeparam">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="From"/>
        <xs:element ref="To"/>
      </xs:sequence>
      <xs:attribute ref="FieldId" use="required"/>
    </xs:complexType>
  </xs:element>
 
 
  <!-- COMPLEX ELEMENTS LVL 1 -->
  <xs:element name="doctypes">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="doctype"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
 
  <xs:element name="params">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="wordparam"   minOccurs="0"/>
        <xs:element ref="dateparam"   minOccurs="0"/>
        <xs:element ref="timeparam"   minOccurs="0"/>
        <xs:element ref="csvparam"    minOccurs="0"/>
        <xs:element ref="stringparam" minOccurs="0"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
 
  <!-- PRINCIPAL -->
 <xs:element name="query">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="doctypes"/>
        <xs:element ref="params"/>
        <xs:element ref="orderby"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
 
</xs:schema>

l'erreur de retour est "L'élément 'query' n'est pas déclaré."

ce qui est le plus etrange c que quand je fais le test directement dans un logiciel de traitement xml ( stylus ) , la validation se passe sans probleme !!!!

par avance merci pour votre aide

A++