What is the term “capability” in OGC used for?
Each GIS service defined in OGC has a capability file encoded in XML. There is no common format for the capability valid across all the OGC defined services. All the OGC services has getCapability service interface in order to return capabilities metadata. Capabilities function as “service” metadata, providing information about what the service offers. Clients to the services determine whether they can work with that server based on its capabilities.