<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="TransactionOperation">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="GradeConfirm" />
        <xs:element name="NozzleNo" type="xs:string"/>
        <xs:element name="TrxId" type="xs:int" />
      </xs:sequence>
      <xs:attribute name="OpType" type="OpType" use="required" />
    </xs:complexType>
  </xs:element>

  <xs:simpleType name="OpType">
    <xs:restriction base="xs:string">
      <xs:enumeration value="Delete"/>
      <xs:enumeration value="NozzleSelect"/>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>