}

				if len(pl.Items) < 1 {
					return errors.New("no pods found")
				}

				if len(pl.Items) > 1 {
					log.Warnf("more than 1 pods fits selector: %s; will use pod: %s", istiodLabelSelector, pl.Items[0].Name)
				}

				// only use the first pod in the list
				podName = pl.Items[0].Name
				ns = pl.Items[0].Namespace
			} else if len(args) == 1 {

  // ResourceClaimSpec.
  // +optional
  optional ResourceClassParametersReference parametersRef = 3;

  // Only nodes matching the selector will be considered by the scheduler
  // when trying to find a Node that fits a Pod when that Pod uses
  // a ResourceClaim that has not been allocated yet.
  //
  // Setting this field is optional. If null, all nodes are candidates.
  // +optional

				}

				if len(pl.Items) < 1 {
					return errors.New("no pods found")
				}

				if len(pl.Items) > 1 {
					log.Warnf("more than 1 pods fits selector: %s; will use pod: %s", labelSelector, pl.Items[0].Name)
				}

				// only use the first pod in the list
				podName = pl.Items[0].Name
				ns = pl.Items[0].Namespace
			} else {

  // +optional
  optional string serviceAccount = 9;

  // NodeName is a request to schedule this carp onto a specific node. If it is non-empty,
  // the scheduler simply schedules this carp onto that node, assuming that it fits resource
  // requirements.
  // +optional
  optional string nodeName = 10;

  // Host networking requested for this carp. Use the host's network namespace.

  optional bool automountServiceAccountToken = 21;

  // NodeName is a request to schedule this pod onto a specific node. If it is non-empty,
  // the scheduler simply schedules this pod onto that node, assuming that it fits resource
  // requirements.
  // +optional
  optional string nodeName = 10;

  // Host networking requested for this pod. Use the host's network namespace.

  // query parameters (except for the value of continue) and the server may reject a continue value it
  // does not recognize. If the specified continue value is no longer valid whether due to expiration
  // (generally five to fifteen minutes) or a configuration change on the server, the server will
  // respond with a 410 ResourceExpired error together with a continue token. If the client needs a

See the
[design doc](https://docs.google.com/document/d/11j9ZtYWNWnxQYnZy8ayZav1FMwTH6F6z6fkDYZ7V298/edit#heading=h.qex63c29z2to)
for a more complete design description. The operator code is divided roughly into five areas:

1. [IstioOperatorSpec API](#istiooperatorspec-api) and related infrastructure, which is expressed as a
[proto](https://github.com/istio/api/blob/master/operator/v1alpha1/operator.proto) and
compiled to [Go