A system that uses a Uniform Resource Identifier (URI) to uniquely identify a class of resources. The schema uses a URI with a placeholder substituted for the resource name, effectively creating a URI template. Processing of the URI template facilitates retrieval of resource class information. If specificity is required, the URI template can be converted to a specific URI by replacing the placeholder with the name of a given resource or instance to get information about that particular instance. URI templates allow probes to be identified and the probe characteristics to be understood without actually retrieving the probe for a particular instance.