See indexterm (db.indexterm.singular).

Common attributes and common linking attributes.

any attribute

Any attribute in any other explicit namespace

class

Identifies the class of index term

Enumerated values:
“endofrange”	The end of a range

startref

Points to the start of the range

These elements contain indexterm: abbrev, abstract, accel, acknowledgements, acronym, address, annotation, answer, appendix, application, arg, article, artpagenums, attribution, authorinitials, bibliocoverage, bibliodiv, bibliography, biblioid, bibliolist, bibliomisc, bibliomixed, bibliomset, bibliorelation, bibliosource, blockquote, bridgehead, buildtarget, callout, calloutlist, caption (db.caption), caption (db.html.caption), caution, chapter, citation, citebiblioid, citetitle, city, classname, classsynopsisinfo, code, colophon, command, computeroutput, confdates, confnum, confsponsor, conftitle, constant, constraintdef, contractnum, contractsponsor, contrib, country, danger, database, dedication, description, edition, email, emphasis (db._emphasis), emphasis (db.emphasis), entry, enumidentifier, enumitemdescription, enumname, enumvalue, envar, errorcode, errorname, errortext, errortype, example, exceptionname, fax, figure, filename, firstname, firstterm (db._firstterm), firstterm (db.firstterm), footnote, foreignphrase (db._foreignphrase), foreignphrase (db.foreignphrase), formalpara, funcdef, funcparams, funcsynopsisinfo, function, givenname, glossary, glossdef, glossdiv, glossentry, glosslist, glosssee, glossseealso, glossterm (db._glossterm), glossterm (db.glossterm), guibutton, guiicon, guilabel, guimenu, guimenuitem, guisubmenu, hardware, holder, honorific, important, index, indexdiv, informalexample, informalfigure, informaltable (db.cals.informaltable), initializer, interfacename, issuenum, itemizedlist, jobtitle, keycap, keycode, keysym, label, legalnotice, lineage, lineannotation, link, listitem, literal, literallayout, macroname, manvolnum, markup, mathphrase, member, meta (db.meta.content), methodname, modifier, mousebutton, msgaud, msgexplan, msglevel, msgorig, msgtext, note, olink, option, optional, orderedlist, orgdiv, orgname, otheraddr, othername, package, pagenums, para, paramdef, parameter, partintro, personname, phone, phrase (db._phrase), phrase (db.phrase), pob, postcode, preface, primary, primaryie, procedure, productname, productnumber, programlisting, prompt, property, publishername, qandadiv, qandaset, question, quote (db._quote), quote (db.quote), refdescriptor, refentry, refentrytitle, refmeta, refmiscinfo, refname, refpurpose, refsect1, refsect2, refsect3, refsection, refsynopsisdiv, releaseinfo, remark, replaceable, result, returnvalue, revdescription, revnumber, revremark, screen, secondary, secondaryie, sect1, sect2, sect3, sect4, sect5, section, see, seealso, seealsoie, seeie, seg, segtitle, seriesvolnums, setindex, shortaffil, sidebar, simpara, simplesect, specializedtemplate, state, step, street, subscript, subtitle, superscript, surname, symbol, synopsis, synopsisinfo, systemitem, table (db.cals.table), tag, taskprerequisites, taskrelated, tasksummary, td, template, templatename, term, termdef, tertiary, tertiaryie, textobject, th, tip, title, titleabbrev, toc, tocdiv, tocentry, token, topic, trademark, type, typedefname, unionname, uri, userinput, variablelist, varname, volumenum, warning, wordasword, year.