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Reference element based on simpleType

File: Data.xml <?xml version="1.0"?> <airport xmlns="http://www.rntsoft.com"                    xmlns:ex="http://www.rntsoft.com"                    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"                    xsi:schemaLocation= "http://www.rntsoft.com Schema.xsd">     <aircraft/>                   <aircraft>F-16</aircraft> </airport> File: Schema.xsd <?xml version="1.0"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"             targetNamespace="http://www.rntsoft.com"             xmlns="http://www.rntsoft.com"             elementFormDefault="qualified">     <xsd:element name="aircraft" default="Boeing 747">         <xsd:simpleType>             <xsd:restriction base="xsd:string">                 <xsd:enumeration value="Boeing 747"/>                 <xsd:enumeration value="F-16"/>                 <xsd:enumeration value="A-10"/>             </xsd:restriction>         </xsd:simpleType>     </xsd:element>     <xsd:element name="airport">         <xsd:complexType>             <xsd:sequence>                 <xsd:element ref="aircraft" maxOccurs="2"/>             </xsd:sequence>         </xsd:complexType>     </xsd:element> </xsd:schema>