A WebServer is an agent (an element in a running computer system), addressible by a URI, which offers zero or more WebService's.
Or maybe not. Maybe this is a WebServingAgent, and WebServer is a computer system which hosts WebServingAgents. Something like that.
this is silly -- defer to TAG.
I wanted this for SemanticWebServer, which might be renamed as.... SemanticWebServiceAgent? KnowledgeBasedAgent? SemanticWebServerAgent? Eh.