| http://www.w3.org/ns/prov#value | - In the case where one group such as a family or a company possesses two or more IRDs, this IRD_Gr_ID is a group ID number for identifying the group, and these IRDs are assigned the same IRD_Gr_ID. Since these IRDs are assigned the respective IRD_ID as well, these IRDs can be identified not only in the group unit but also in the IRD units.
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