<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
     xmlns:s="http://www.w3.org/TR/WD-rdf-schema#">

<!--

Specific state maintenance of SDLIP.
See also:
1) http://www-diglib.stanford.edu:8080/~testbed/doc/SDLIP/sdlip.htm
2) http://www-diglib.stanford.edu/diglib/ginf/1999/05/26-core-state"/>
  
Usage:

Client is allowed to request additional time by sending MoreTime
request. If the server sends back Prolongation specifying how many
seconds it is willing to keep state (this period can ... from that
requested). If the server is fed up is sends
Comm/StateMaintenance/InvalidState

-->

<s:Class rdf:ID="MoreTime">
	<s:subClassOf rdf:resource="http://www-diglib.stanford.edu/diglib/ginf/1999/05/26-core-comm#Request"/>
	<s:comment>A request by the client to prolong the state info</s:comment>
</s:Class>

<s:Class rdf:ID="Prolongation">
	<s:subClassOf rdf:resource="http://www-diglib.stanford.edu/diglib/ginf/1999/05/26-core-comm#Reply"/>
	<s:comment>The server agrees to prolong by "by" seconds</s:comment>
</s:Class>

<s:Property rdf:ID="by">
	<s:comment>Seconds for the session to persist. Range is an integer.</s:comment>
	<s:domain rdf:resource="#MoreTime"/>
	<s:domain rdf:resource="#Prolongation"/>
</s:Property>

</rdf:RDF>