Xml-Schema validation

I have a file .xsd which validates my xml file. The problem is that it works for one element, but when I have more than one it doesn't work and I can't find the problem.

This is my .xml file:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    <UrlList>
    <url>
        <url>http://ift.tt/141p5ki;
        <idUrl>72</idUrl>
        <urlShort>http://ift.tt/1AmGYXo;
        <numVisits>2</numVisits>
    </url>
    <url>
        <url>http://ift.tt/141p5Ay;
        <idUrl>73</idUrl>
        <urlShort>http://ift.tt/1AmGWi6;
        <numVisits>1</numVisits>
    </url>
</UrlList>

And this is my .xsd file:

<xs:schema xmlns:xs="http://ift.tt/tphNwY">
    <xs:element name="UrlList">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="url"/>
            </xs:sequence>
        </xs:complexType>
    </xs:element>

    <xs:element name="url">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="url" type="xs:string"/>
                <xs:element name="idUrl" type="xs:integer"/>
                <xs:element name="urlShort" type="xs:string"/>
                <xs:element name="numVisits" type="xs:integer"/>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

Need help please!!