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

<!--

EXTERNAL INTERFACE

Usage: an overloaded server issues a Redirect reply.  If the client
has a load balancing layer it sends the same request again to the new
destination (processing entity).

-->

<s:Class rdf:ID="Redirect">
	<s:subClassOf rdf:resource="http://www-diglib.stanford.edu/diglib/ginf/1999/05/26-core-comm#Reply"/>
	<s:comment>Sends a redirect reply. Client is supposed to retry
		at another server.</s:comment>
</s:Class>

<rdf:Property rdf:ID="delegate">
	<s:subPropertyOf rdf:resource="http://www-diglib.stanford.edu/diglib/ginf/1999/05/26-core-comm#deliveryInfo"/>
	<s:domain rdf:resource="#Redirect"/>
	<s:range rdf:resource="http://www-diglib.stanford.edu/diglib/ginf/1999/05/26-core-comm#ProcessingEntity"/>
</rdf:Property>

<!--

INTERNAL INTERFACE

Usage: load balancing layer (LBL) attaches GetLoad request to the
original message and forwards it to the server.
If the server is load balancing-aware it attaches LoadInfo to the
response. If not, LBL knows that the server does not support
load balancing.

-->

<s:Class rdf:ID="GetLoad">
	<s:subClassOf rdf:resource="http://www-diglib.stanford.edu/diglib/ginf/1999/05/26-core-comm#Request"/>
	<s:comment>Asks to provide load information</s:comment>
</s:Class>

<s:Class rdf:ID="LoadInfo">
	<s:subClassOf rdf:resource="http://www-diglib.stanford.edu/diglib/ginf/1999/05/26-core-comm#Reply"/>
	<s:comment>Load information</s:comment>
</s:Class>

<rdf:Property rdf:ID="estimatedLoad">
	<s:domain rdf:resource="#LoadInfo"/>
	<s:comment>Provides estimated load information.
		Range must be an integer between 0 and 100</s:comment>
</rdf:Property>


</rdf:RDF>