property_path - Property path to executing instance or collection

A process can be implemented in the database context, in which case a property path must not be defined.

When the process requires a calling object instance or collection for execution, the property path provides the instance or collection path for execution. When referring to an instance, the process must be implemented as an action in the context of the type of the referenced instance. In case of referring to a collection,the process action must be implemented in the property context of the referenced collection.

Before calling the action the path locates the referenced instance or collection.