Bonjour,

Je viens de commencer la programmation XML et j'ai rencontré un problème au niveau d'un exercice concernant la création d'un schéma d'un Code XML 

Voici le code XML dont je veux créer le schéma:

<?xml version="1.0" encoding="UTF-8"?>
<students xmlns="http://www.oxygenxml.com/ns/samples/students"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.oxygenxml.com/ns/samples/ TP2XSD.xsd">
   
    <student stuID="si">
        <lastName>Berstein</lastName>
        <firstName>Cynthia</firstName>
        <dateOfEnrollment>2017-05-22</dateOfEnrollment>
        <credits>12</credits>
        <gpa degree="MP">3.81</gpa>
    </student>
    
    <student stuID="sik">
        <lastName>Boothe</lastName>
        <firstName>Jennifer</firstName>
        <dateOfEnrollment>2017-12-22</dateOfEnrollment>
        <credits>38</credits>
        <gpa degree="WPA">3.14</gpa>
    </student>
    
</students>

Voici le code XSD que j'ai créé:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
    targetNamespace="http://www.oxygenxml.com/ns/samples/students">
    <xs:element name="students">
        <xs:complexType>
            <xs:sequence>
            <xs:element name="student"> 
                <xs:complexType > 
                        <xs:sequence>
                        <xs:element name = "lastName" type ="xs:string"/>
                        <xs:element name = "firstName" type ="xs:string"/>
                        <xs:element name = "dateOfEnrollment" type ="xs:date"/>
                        <xs:element name = "credits" type ="xs:integer"/>
                        <xs:element name = "gpa">
                            <xs:complexType> 
                                <xs:attribute name="degree" type="xs:integer"> </xs:attribute>
                            </xs:complexType>
                        </xs:element>
                        </xs:sequence>
                    <xs:attribute name="stuID" type="xs:double"> </xs:attribute>
                </xs:complexType>
            </xs:element>
            </xs:sequence>
    </xs:complexType >
     
    </xs:element>        
    
        
</xs:schema>

Mais en voulant valider le fichier XML, l'erreur suivante s'affiche: