Top level of OWL ontology for services. Part of the OWL-S ontology; see http://www.daml.org/services/.
There are no cardinality restrictions on this property.
A service has 0 or 1 models. (But note that a service with 0 models does not provide automated online access; it exists only for discovery purposes; that is, it exists so as to provide a Profile.)
There are no cardinality restrictions on this property. That is, the same service model can be used by many different services.
A Grounding must be associated with exactly one service. (Also, that service must have a model - but that constraint isn't expressed here.)
OWL-S is completely agnostic at present about what kind of thing provides a service (hence, no domain declared here).