<?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>