The following DataNodes have no identifier: 5
http://classic.wikipathways.org/instance/WP3234_r117613 http://rdf.wikipathways.org/Pathway/WP3234_r117613/DataNode/c1483 (GPX)
http://classic.wikipathways.org/instance/WP3234_r117613 http://rdf.wikipathways.org/Pathway/WP3234_r117613/DataNode/d53c1 (PPi)
http://classic.wikipathways.org/instance/WP3234_r117613 http://rdf.wikipathways.org/Pathway/WP3234_r117613/DataNode/c5e47 (Substrate)
http://classic.wikipathways.org/instance/WP3234_r117613 http://rdf.wikipathways.org/Pathway/WP3234_r117613/DataNode/ce3d2 (Substrate sulfate)
http://classic.wikipathways.org/instance/WP3234_r117613 http://rdf.wikipathways.org/Pathway/WP3234_r117613/DataNode/c1752 (Sulfotransferase)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier