BIBFRAME RDF Convention #8 states: use rdf:value and rdfs:label as appropriate when supplying the value of a resource. I am having trouble understanding when rdf:value is used. I can't induce a rule from examples in the BIBFRAME specifications (transcribed below) and RDF Schema 1.1 [1] doesn't throw much light on it. Can someone explain what appropriate use of rdf:value is? --------------------------------------------- Identifiers Example 1 bf:identifiedBy [ a bf:Isbn rdf:value "9783110413014" ] . Example 2 bf:identifiedBy [ a identifier:ABC ; rdf:value "MX3-387" ] . Example 3 bf:identifiedBy [ a bf:Identifier ; bf:source "xyz" ; rdf:value "1234567890" ] . Notes Example 3 bf:baseMaterial [ bf:code [ rdf:value "o" ; bf:source [rdf:value "marc007ng04" ] ] ; bf:note [ a bf:Note ; rdfs:label "Image printed on thick gold paper." ] ] . Item Example (truncated) <http://bibframe.example.org/item/itemZ> bf:shelfMarkLcc [rdf:value "LB2395.C65 1991" ] ; bf:usageAndAccessPolicy [ a bf:AccessPolicy ; rdf:value "unrestricted" ] . Administrative Metadata Example <http://bibframe.example.org/item/instanceX> a bf:Instance ; bf:title [rdfs:label "Medical history" ] ; bf:identifiedBy [ a bf:Issn ; rdf:value "2168-7633" ; bf:adminMetadata [ a bf:AdminMetadata ; bf:assigner "United States" ] ] . [1] https://www.w3.org/TR/2014/PER-rdf-schema-20140109/