@idCet attribut joue le rôle d'ancre et peut servir de cible à un lien. Il permet d'identifier de manière unique un élément dans un document XML. Il doit commencer par une lettre.
dbk:@id<1>htm:@id<2>tei:@id<3>address, addrline, affiliation, answer, article, attendee, available, bibliography, book, calendar, century, chapter, citation, code, collection, colophon, colors, compression, concept, condition, contact, contents, contributor, copyright, country, coverage, creator, culture, date, day, definition, depth, description, dimensions, edition, emphasis, enumeration, event, example, excerpt, extent, family, faq, figure, formalpara, format, genre, geoname, given, glossary, honorific, identifier, index, info, item, licence, lineage, link, literallayout, locality, location, material, medium, month, name, nationality, note, number, organization, orgdiv, orgname, orgtitle, pagination, para, part, period, persname, person, place, placename, precision, primary, procedure, proper, property, pseudonym, publisher, question, record, refcada, referee, relation, resource, rights, scale, secondary, section, see, seealso, sequence, set, source, span, step, streetname, streetnumber, streettype, subject, subtitle, summary, support, table, tbody, technique, term, territory, territoryname, tertiary, tfoot, thead, title, topicname, tr, unqualified, value, volume, xml ; <1> http://www.docbook.org/tdg/en/html/ref-elements.html#common.attributes