XML Protocols - slide "XMLP Header"

May be attached to an envelope
Content is application dependent (through namespaces) but extra XMLP attributes are defined:
- actor: defines intermediaries along a message path; eg, if the intermediary is reached, that element is not forwarded
- mustUnderstand: intermediary MUST (or not) understand the full semantics or raise an error

Start	"Inter"	Target
<Header> <t:sth xmlns:t="..." actor="Inter"> .... </t:sth> <q:el xmlns:q="..."> ... </q:el> </Header>	<Header> <t:sth xmlns:t="..." actor="Inter"> .... </t:sth> <q:el xmlns:q="..."> ... </q:el> </Header>	<Header> <q:el xmlns:q="..."> ... </q:el> </Header>

Start

"Inter"

Target

<Header>
  <t:sth xmlns:t="..."
    actor="Inter">
    ....
  </t:sth>
  <q:el xmlns:q="...">
    ...
  </q:el>
</Header>

<Header>
  <t:sth xmlns:t="..."
    actor="Inter">
    ....
  </t:sth>
  <q:el xmlns:q="...">
    ...
  </q:el>
</Header>

<Header>
  <q:el xmlns:q="...">
    ...
  </q:el>
</Header>