# XML Schema Documentation

### Complex Type: MessageHeader

#### [Table of contents]

Super-types: | None
Sub-types: | NotificationMessageHeader (by extension) RequestMessageHeader (by extension) ResponseMessageHeader (by extension)

Name | MessageHeader
Abstract | yes
Documentation | A type defining the content model for a generic message header that is refined by its derived classes.

XML Instance Representation
<...>
<conversationId> ConversationId </conversationId> [0..1]

'The unique identifier (name) for the conversation (session), this message is within. A conversation identifier is usually assigned by the initiator of a conversation. Conversations may only be initiated and terminated. Joining conversations has the effect of initiating new conversations. Conversations cannot be split; this instead has the effect of parallel activities on the same conversation or the initiation of a new conversation. Each message belongs to only one conversation. Conversation scopes are defined in the business process definition.'

<messageId> MessageId </messageId> [1]

'A unique identifier (within its coding scheme) assigned to the message by its creating party.'

</...>
Diagram
Schema Component Representation
<xsd:complexType name="MessageHeader" abstract="true">
<xsd:sequence>
<xsd:element name="conversationId" type=" ConversationId " minOccurs="0"/>
<xsd:element name="messageId" type=" MessageId "/>
</xsd:sequence>
</xsd:complexType>