This class represents actions performed on a specimen in order to prepare it for future testing. Such actions may include adding an additive or placing the specimen in a container containing a pre-defined additive in order to preserve, maintain or enhance the particular nature or component of the specimen. Other actions include aliquoting a single specimens into multiple subsets, grouping or pooling multiple specimens into one specimen, etc. As a result of this processing event, a new specimen(s) may be created, thus this class contains a pointer (zero-to-many) back to the Specimen class to identify the newly-created Specimen(s). "Details concerning processing and processing steps for the specimen." - HL7 FHIR, Specimen.processing