<?xml version="1.0" encoding="UTF-8" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:element name="rootObject">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="firstInteger" type="xs:unsignedLong" />
        <xs:element name="firstString" type="xs:string" />
        <xs:element name="thirdElement" type="xs:unsignedLong" minOccurs="0" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>

</xs:schema>
