Schema file:
------------------------------------------------------------------------
<xs:schema  xmlns:xs="http://www.w3.org/2001/XMLSchema">
     <xs:complexType name="rpcType">
       <xs:sequence>
         <xs:element ref="rpcOperation"/>
       </xs:sequence>
       <xs:attribute name="message-id" type="xs:string" use="required"/>
     </xs:complexType>
     <xs:element name="rpc" type="rpcType"/>

     <xs:simpleType name="SessionId">
       <xs:restriction base="xs:unsignedInt"/>
     </xs:simpleType>

     <xs:simpleType name="ErrorType">
       <xs:restriction base="xs:string">
         <xs:enumeration value="transport"/>
         <xs:enumeration value="rpc"/>
         <xs:enumeration value="protocol"/>
         <xs:enumeration value="application"/>
       </xs:restriction>
     </xs:simpleType>

     <xs:simpleType name="ErrorTag">
       <xs:restriction base="xs:string">
         <xs:enumeration value="TOO_BIG"/>
         <xs:enumeration value="MISSING_ATTRIBUTE"/>
         <xs:enumeration value="BAD_ATTRIBUTE"/>
         <xs:enumeration value="UNKNOWN_ATTRIBUTE"/>
         <xs:enumeration value="MISSING_ELEMENT"/>
         <xs:enumeration value="BAD_ELEMENT"/>
         <xs:enumeration value="UNKNOWN_ELEMENT"/>
         <xs:enumeration value="ACCESS_DENIED"/>
         <xs:enumeration value="LOCK_DENIED"/>
         <xs:enumeration value="RESOURCE_DENIED"/>
         <xs:enumeration value="ROLLBACK_FAILED"/>
         <xs:enumeration value="DATA_EXISTS"/>
         <xs:enumeration value="DATA_MISSING"/>
         <xs:enumeration value="OPERATION_NOT_SUPPORTED"/>
         <xs:enumeration value="OPERATION_FAILED"/>
         <xs:enumeration value="PARTIAL_OPERATION"/>
       </xs:restriction>
     </xs:simpleType>

     <xs:simpleType name="ErrorSeverity">
       <xs:restriction base="xs:string">
         <xs:enumeration value="error"/>
         <xs:enumeration value="warning"/>
       </xs:restriction>
     </xs:simpleType>

     <xs:complexType name="rpc-errorType">
       <xs:sequence>
         <xs:element name="error-type" type="ErrorType"/>
         <xs:element name="error-tag" type="ErrorTag"/>
         <xs:element name="error-severity" type="ErrorSeverity"/>
         <xs:element name="error-app-tag" type="xs:string" minOccurs="0"/>
         <xs:element name="error-path" type="xs:string" minOccurs="0"/>
         <xs:element name="error-message" type="xs:string" minOccurs="0"/>
         <xs:element name="error-info" type="xs:anyType" minOccurs="0"/>
       </xs:sequence>
     </xs:complexType>

     <!-- Standard elements used in the error-info container  -->
     <xs:element name="bad-attribute" type="xs:QName"/>
     <xs:element name="bad-element" type="xs:QName"/>
     <xs:element name="ok-element" type="xs:QName"/>
     <xs:element name="err-element" type="xs:QName"/>
     <xs:element name="noop-element" type="xs:QName"/>
     <xs:element name="session-id" type="SessionId"/>

     <xs:complexType name="rpc-replyType">
       <xs:choice>
         <xs:element name="ok" minOccurs="0"/>
         <xs:element name="rpc-error" type="rpc-errorType" minOccurs="0"/>
         <xs:element ref="config" minOccurs="0"/>
         <xs:element ref="data" minOccurs="0"/>
       </xs:choice>
       <xs:attribute name="message-id" type="xs:string" use="required"/>
     </xs:complexType>
     <xs:element name="rpc-reply" type="rpc-replyType"/>
     <xs:simpleType name="test-optionType">
       <xs:restriction base="xs:string">
         <xs:enumeration value="test"/>
         <xs:enumeration value="test-then-set"/>
         <xs:enumeration value="set"/>
       </xs:restriction>
     </xs:simpleType>
     <xs:element name="test-option" type="test-optionType"/>
     <xs:simpleType name="error-optionType">
       <xs:restriction base="xs:string">
         <xs:enumeration value="stop-on-error"/>
         <xs:enumeration value="ignore-error"/>
       </xs:restriction>
     </xs:simpleType>
     <xs:element name="error-option" type="error-optionType"/>
     <xs:complexType name="rpcOperationType">
         <xs:annotation>
         </xs:annotation>
     </xs:complexType>
     <xs:element name="rpcOperation" type="rpcOperationType" abstract="true"/>
     <xs:complexType name="config-inlineType">
       <xs:complexContent>
         <xs:extension base="xs:anyType">
         </xs:extension>
       </xs:complexContent>
     </xs:complexType>
     <xs:element name="data" type="xs:string"/>
     <xs:element name="config" type="config-inlineType"/>
     <xs:element name="filter" type="config-inlineType"/>
     <xs:complexType name="config-nameType"/>
     <xs:element name="config-name" type="config-nameType" abstract="true"/>
     <xs:element name="startup" type="config-nameType" substitutionGroup="config-name"/>
     <xs:element name="candidate" type="config-nameType" substitutionGroup="config-name"/>
     <xs:element name="running" type="config-nameType" substitutionGroup="config-name"/>
     <xs:complexType name="config-uriType">
       <xs:simpleContent>
         <xs:extension base="xs:anyURI">
          </xs:extension>
       </xs:simpleContent>
     </xs:complexType>
     <xs:element name="url" type="config-uriType"/>
     <xs:complexType name="rpcOperationSourceType">
       <xs:choice>
         <xs:element ref="config"/>
         <xs:element ref="config-name"/>
         <xs:element ref="url"/>
       </xs:choice>
     </xs:complexType>
     <xs:element name="source" type="rpcOperationSourceType"/>
     <xs:complexType name="rpcOperationTargetType">
       <xs:choice>
         <xs:element ref="config-name"/>
         <xs:element ref="url"/>
       </xs:choice>
     </xs:complexType>
     <xs:element name="target" type="rpcOperationTargetType"/>
     <xs:complexType name="get-configType">
       <xs:complexContent>
         <xs:extension base="rpcOperationType">
           <xs:sequence>
             <xs:element ref="source"/>
             <xs:element ref="filter" minOccurs="0"/>
           </xs:sequence>
         </xs:extension>
       </xs:complexContent>
     </xs:complexType>
     <xs:element name="get-config" type="get-configType" substitutionGroup="rpcOperation"/>
     <xs:complexType name="edit-configType">
       <xs:complexContent>
         <xs:extension base="rpcOperationType">
           <xs:sequence>
             <xs:element ref="source" minOccurs="0"/>
             <xs:element ref="target"/>
             <xs:element ref="test-option" minOccurs="0"/>
             <xs:element ref="error-option" minOccurs="0"/>
             <xs:element ref="config" minOccurs="0"/>
           </xs:sequence>
         </xs:extension>
       </xs:complexContent>
     </xs:complexType>
     <xs:element name="edit-config" type="edit-configType" substitutionGroup="rpcOperation"/>
     <xs:complexType name="copy-configType">
       <xs:complexContent>
         <xs:extension base="rpcOperationType">
           <xs:sequence>
             <xs:element ref="source"/>
             <xs:element ref="target"/>
           </xs:sequence>
         </xs:extension>
       </xs:complexContent>
     </xs:complexType>
     <xs:element name="copy-config" type="copy-configType" substitutionGroup="rpcOperation"/>
     <xs:complexType name="delete-configType">
       <xs:complexContent>
         <xs:extension base="rpcOperationType">
           <xs:sequence>
             <xs:element ref="target"/>
           </xs:sequence>
         </xs:extension>
       </xs:complexContent>
     </xs:complexType>
     <xs:element name="delete-config" type="delete-configType" substitutionGroup="rpcOperation"/>
     <xs:complexType name="getType">
       <xs:complexContent>
         <xs:extension base="rpcOperationType">
           <xs:sequence>
             <xs:element ref="filter" minOccurs="0"/>
           </xs:sequence>
         </xs:extension>
       </xs:complexContent>
     </xs:complexType>
     <xs:element name="get" type="getType" substitutionGroup="rpcOperation"/>
     <xs:complexType name="lockType">
       <xs:complexContent>
         <xs:extension base="rpcOperationType">
           <xs:sequence>
             <xs:element ref="target"/>
           </xs:sequence>
         </xs:extension>
       </xs:complexContent>
     </xs:complexType>
     <xs:element name="lock" type="lockType" substitutionGroup="rpcOperation"/>
     <xs:complexType name="unlockType">
       <xs:complexContent>
         <xs:extension base="rpcOperationType">
           <xs:sequence>
             <xs:element ref="target"/>
           </xs:sequence>
         </xs:extension>
       </xs:complexContent>
     </xs:complexType>
     <xs:element name="unlock" type="unlockType" substitutionGroup="rpcOperation"/>
     <xs:complexType name="validateType">
       <xs:complexContent>
         <xs:extension base="rpcOperationType">
           <xs:sequence>
             <xs:element ref="source"/>
           </xs:sequence>
         </xs:extension>
       </xs:complexContent>
     </xs:complexType>
     <xs:element name="validate" type="validateType" substitutionGroup="rpcOperation"/>
     <xs:complexType name="commitType">
       <xs:complexContent>
         <xs:extension base="rpcOperationType">
           <xs:sequence>
             <xs:element name="confirmed" minOccurs="0"/>
             <xs:element name="confirmed-timeout" minOccurs="0"/>
           </xs:sequence>
         </xs:extension>
       </xs:complexContent>
     </xs:complexType>
     <xs:element name="commit" type="commitType" substitutionGroup="rpcOperation"/>
     <xs:complexType name="discard-changesType">
       <xs:complexContent>
         <xs:extension base="rpcOperationType"/>
       </xs:complexContent>
     </xs:complexType>
     <xs:element name="discard-changes" type="discard-changesType" substitutionGroup="rpcOperation"/>
     <xs:complexType name="close-sessionType">
       <xs:complexContent>
         <xs:extension base="rpcOperationType"/>
       </xs:complexContent>
     </xs:complexType>
     <xs:element name="close-session" type="close-sessionType" substitutionGroup="rpcOperation"/>
     <xs:complexType name="kill-sessionType">
       <xs:complexContent>
         <xs:extension base="rpcOperationType">
           <xs:sequence>
             <xs:element name="session-id" type="SessionId" minOccurs="0"/>
           </xs:sequence>
         </xs:extension>
       </xs:complexContent>
     </xs:complexType>
     <xs:element name="kill-session" type="kill-sessionType" substitutionGroup="rpcOperation"/>
   </xs:schema>

Input XML file, which is validated against the above schema.
-----------------------------------------------------------------------------
<rpc message-id="114">
  <edit-config>
    <error-option>rollback-on-error</error-option>
    <target>
      <running/>
    </target>
    <config>
        <interfaces>
                <interface>
                        <name> eth0 </name>
                </interface>
        </interfaces>
    </config>
  </edit-config>
</rpc>

Validation result :
--------------------------------------------------------------------------------
command.xml:0: element rpc: Schemas validity error : Element rpc content check failed

Validation result = [10]