<?xml version = "1.0" encoding = "UTF-8"?>

<xsd:schema
   xmlns:xsd = "http://www.w3.org/2001/XMLSchema"
   >
    <xsd:element name = "vehicles">
     <xsd:complexType>
      <xsd:sequence>
       <xsd:element name = "nickname" 
                    type = "xsd:string"
                    maxOccurs = "unbounded"/>
      </xsd:sequence>
     </xsd:complexType>
    </xsd:element>
</xsd:schema>