| http://www.w3.org/ns/prov#value | - 41 The protocol is a NISO standard, http://www.niso.org/z39.50/z3950.html, which is maintained by the Library of Congress, http://www.loc.gov/z3950/agency, and ISO standard http://www.iso.org/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=27446.
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