@classDans certains contextes d'utilisation du schéma, les attributs généraux du schémas ne suffisent pas. Dans ces cas, cet attribut offre une solution supplémentaire. Il s'agit un peu d'un attribut "personnalisable" sans sémantique particulière.
dbk:@condition<1>htm:@class<2>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
<2> http://www.w3.org/TR/html4/struct/global.html#adef-class