After examination, the laboratory shall define how long samples are kept and under what conditions, and shall make sure that: the identity of the patient and of the sample source is preserved; it is known whether the sample is still fit for further examination; storage keeps that fitness as well as possible; the sample can be found and retrieved when needed; and it is disposed of properly.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.