| http://www.w3.org/ns/prov#value | - The cartridges are preferably identified by their respective cartridge identifiers as illustrated in FIGS. 6A-6E. As an additional level of assurance, a policy may require that a cartridge be identified by more than one identifier, such as a value stored in a cartridge memory (FIG. 6A) and on an external bar code label (FIG. 6B).
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