docs: def resolve(self, link_resource_type, resource_id, array=None):
          """Resolve a link to a CDA resource.
  
          Provided an `array` argument, attempt to retrieve the resource from the `mapped_items`
          section of that array (containing both included and regular resources), in case the
          resource cannot be found in the array (or if no `array` was provided) - attempt to fetch
          the resource from the API by issuing a network request.
  
          :param link_resource_type: (str) Resource type as str.
          :param resource_id: (str) Remote ID of the linked resource.
          :param array: (:class:`.Array`) Optional array resource.
          :return: :class:`.Resource` subclass, `None` if it cannot be retrieved.
          """
          result = None
  
          if array is not None:
              container = array.items_mapped.get(link_resource_type)
              result = container.get(resource_id)
  
          if result is None:
              clz = utils.class_for_type(link_resource_type)
              result = self.fetch(clz).where({'sys.id': resource_id}).first()
  
          return result