ovf allows a disk image to be represented as a set of modified blocks in comparison to a parent image . the use of parent disks can often significantly reduce the size of an ovf package , if it contains multiple disks with similar content . for a disk element , a parent disk may optionally be specified using the parentref attribute , which shall contain a validovf : id reference to a different disk element . if a disk block does not exist locally , lookup for that disk block then occurs in the parent disk . in disksection , parent disk elements shall occur before child disk elements that refer to them . concode_field_sep Long populatedSize concode_elem_sep URI format concode_elem_sep String capacityAllocationUnits concode_elem_sep String id concode_elem_sep String fileRef concode_elem_sep Long capacity concode_elem_sep String parentRef concode_field_sep String getCapacityAllocationUnits concode_elem_sep Builder populatedSize concode_elem_sep Builder format concode_elem_sep Builder capacityAllocationUnits concode_elem_sep String getId concode_elem_sep int compareTo concode_elem_sep Builder capacity concode_elem_sep Builder parentRef concode_elem_sep Builder fromDisk concode_elem_sep Disk build concode_elem_sep int hashCode concode_elem_sep String getFileRef concode_elem_sep boolean equals concode_elem_sep Builder builder concode_elem_sep Long getPopulatedSize concode_elem_sep URI getFormat concode_elem_sep String toString concode_elem_sep Builder id concode_elem_sep Builder fileRef concode_elem_sep Long getCapacity
String function ( ) { return parentRef ; }