Calling services only with quality constraints

[Markus Elfring]

Hello,

The D-Bus programming interface provides a programming interface for the
generic handling of various service properties (or attributes).
https://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-properties

* Did any development happen so that some services provide a similar set
  of properties which can be queried in more detailed ways?

* How do introspection possibilities look like for advanced service categories?

* Did you check constraints on the service implementation quality already?

Regards,
Markus