gistfile1.txt

      // ignored when VolumeName is set
      // +optional
      Selector *metav1.LabelSelector
      // Resources represents the minimum resources required
      // +optional
      Resources ResourceRequirements
      // VolumeName is the binding reference to the PersistentVolume backing this
      // claim. When set to non-empty value Selector is not evaluated
      // +optional
      VolumeName string
      // Name of the StorageClass required by the claim.
      // More info: https://kubernetes.io/docs/concepts/storage/persistent-volumes/#class-1
      // +optional
      StorageClassName *string
      // volumeMode defines what type of volume is required by the claim.
      // Value of Filesystem is implied when not included in claim spec.
      // This is a beta feature.
      // +optional
      VolumeMode *PersistentVolumeMode
      // This field requires the VolumeSnapshotDataSource alpha feature gate to be
      // enabled and currently VolumeSnapshot is the only supported data source.
      // If the provisioner can support VolumeSnapshot data source, it will create
      // a new volume and data will be restored to the volume at the same time.
      // If the provisioner does not support VolumeSnapshot data source, volume will
      // not be created and the failure will be reported as an event.
      // In the future, we plan to support more data source types and the behavior
      // of the provisioner may change.
      // +optional
      DataSource *TypedLocalObjectReference
  }
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


  // TypedLocalObjectReference contains enough information to let you locate the typed referenced object inside the same namespace.
  type TypedLocalObjectReference struct {
      // APIGroup is the group for the resource being referenced.
      // If APIGroup is not specified, the specified Kind must be in the core API group.
      // For any other third-party types, APIGroup is required.
      // +optional
      APIGroup *string
      // Kind is the type of resource being referenced
      Kind string 
      // Name is the name of resource being referenced
      Name string
      // Optional: Extra driver options if any.
      // +optional
      Options map[string]string
  }