Introduction

Enable handler for event triggered on field by adding subscriber. We make the configuration glue between zope.schema (which doesn't depend on zope.component) and zope.component.

Example:

<subscriber
   for=".interfaces.IExampleObject
        zope.schema.interfaces.IText
        zope.schema.interfaces.IFieldUpdatedEvent"
   handler=".localrolefield.set_local_role_on_object" />