Electronic resources, cataloging, cataloguing, notes relating to the contents, notes providing a summary Risorse elettroniche, catalogazione, ISBD(ER), International Standard Bibliographic Description for Electronic Resources, note di sommario, UNIMARC, nota di contenuto, sommario o abstract, MARC21, Dublin Core, FRBR, ISO 214-1976, ANSI/NISO Z39.14-1997