Resources in Semantic Service Descriptions

Dear all, 

My question is about resources in Semantic Web Services Descriptions.
Are they simply not considered, because it is assumed that every service
takes care of the required resources itself or has anybody taken them
into consideration. For interorganizational processes they certainly are
not within the scope of semantic descriptions, because companies
wouldn't want to publish them. But what about different printers that
offer different services to a user for example. Here, some QoS criteria
definitely depend on the amount of other print jobs that printer has in
its queue. And what about five clients trying to use a print service.
Each of them might think the printer is optimal, but when they all try
to access it at the same time, it is far from being the optimal printer.

I have not found anything on resources and Semantic Service Descriptions
so far. Is there any literature on that? 

Thank you in advance.

Regards, 

Jan Ortmann