For journals etc. we need to support linking ISSN, or ISSN-L, so that all ISSNs are correctly shown in one metadata entry. For example:
“Aktuelle Rheumatologie”
ISSN-L 0341-051X
ISSN of print edition 0341-051X
ISSN of online edition 1438-9940
<mods:identifier type="issn-l">0341-051X</mods:identifier>
<mods:identifier type="issn" displayLabel="print_issn">0341-051X</mods:identifier>
<mods:identifier type="issn" displayLabel="online_issn">1438-9940</mods:identifier>
with i18n properties for each display label
Another typical format is "cd" → displayLabel=”cd_issn”. Alternatively to displayLabel we can use type "issn-p", "issn-o" and "issn-cd" ... But I did not find a standardized solution for this.
Medium
For journals etc. we need to support linking ISSN, or ISSN-L, so that all ISSNs are correctly shown in one metadata entry. For example:
“Aktuelle Rheumatologie” ISSN-L 0341-051X ISSN of print edition 0341-051X ISSN of online edition 1438-9940 <mods:identifier type="issn-l">0341-051X</mods:identifier> <mods:identifier type="issn" displayLabel="print_issn">0341-051X</mods:identifier> <mods:identifier type="issn" displayLabel="online_issn">1438-9940</mods:identifier> with i18n properties for each display labelAnother typical format is "cd" → displayLabel=”cd_issn”.
Alternatively to displayLabel we can use type "issn-p", "issn-o" and "issn-cd" ... But I did not find a standardized solution for this.
For more information see:
https://www.issn.org/understanding-the-issn/assignment-rules/the-issn-l-for-publications-on-multiple-media/
https://www.issn.org/services/online-services/access-to-issn-l-table/
https://www.dnb.de/DE/Professionell/Services/ISSN/issn_node.html
http://swbtools.bsz-bw.de/cgi-bin/k10plushelp.pl?cmd=kat&val=2010&katalog=Standard
https://www.loc.gov/marc/bibliographic/bd022.html