A NedFox XML message always contains a 'Messages/Message' part after the 'Envelope' part. So each Interchange message can have a number of messages included. Each message part if started with a message header, described below.

 <xs:complexType name="Message">
    <xs:sequence>
      <xs:element name="MessageDateTime" type="xs:dateTime" minOccurs="1" maxOccurs="1"/>
      <xs:element name="MessageReference" minOccurs="1" maxOccurs="1"/>
      <xs:element name="HighPriority" type="xs:boolean" minOccurs="0" maxOccurs="1"/>
      <xs:element name="Header" type="xsi:Header" maxOccurs="1" minOccurs="1"/>
      <xs:element name="Rows" type="xsi:Rows" maxOccurs="1" minOccurs="1"/>
      <xs:element name="Footer" type="xsi:Footer" maxOccurs="1" minOccurs="1"/>
    </xs:sequence>

Message/MessageDateTime	The Date and Time of this message
Message/MessageReference	The reference / identification of this message
Message/HighPriority	If true this is a High Priority message. It depends on the possibilities of the receiving party and process type what the results of a high priority message will be.
Message/Header	This element refers to a follow header part
Message/Rows	This element refers to following message rows
Message/Footer	This element refers to a following footer part