optional LocalObjectReference localObjectReference = 1;

  // Specify whether the ConfigMap must be defined
  // +optional
  optional bool optional = 2;
}

// Selects a key from a ConfigMap.
// +structType=atomic
message ConfigMapKeySelector {
  // The ConfigMap to select from.
  optional LocalObjectReference localObjectReference = 1;

  // The key to select.
  optional string key = 2;

	// Expected to be non-nil when bound.
	// claim.VolumeName is the authoritative bind between PV and PVC.
	// More info: https://kubernetes.io/docs/concepts/storage/persistent-volumes#binding
	// +optional
	// +structType=granular
	ClaimRef *ObjectReference `json:"claimRef,omitempty" protobuf:"bytes,4,opt,name=claimRef"`
	// persistentVolumeReclaimPolicy defines what happens to a persistent volume when released from its claim.

<pre class="ebnf">
Type      = TypeName [ TypeArgs ] | TypeLit | "(" Type ")" .
TypeName  = identifier | QualifiedIdent .
TypeArgs  = "[" TypeList [ "," ] "]" .
TypeList  = Type { "," Type } .
TypeLit   = ArrayType | StructType | PointerType | FunctionType | InterfaceType |
            SliceType | MapType | ChannelType .
</pre>

<p>
The language <a href="#Predeclared_identifiers">predeclares</a> certain type names.