In Element

<named-content>

Value	Meaning
Data characters	Text, numbers, or special characters.
Restriction: This attribute must be specified if the element is used.

In Elements

<abbrev>, <ack>, <addr-line>, <address>, <aff>, <alt-text>, <annotation>, <app>, <app-group>, <array>, <author-comment>, <bio>, <boxed-text>, <caption>, <chem-struct>, <chem-struct-wrap>, <col>, <colgroup>, <comment>, <conf-date>, <conf-loc>, <conf-name>, <conf-sponsor>, <contrib-group>, <copyright-holder>, <copyright-statement>, <copyright-year>, <country>, <date-in-citation>, <day>, <degrees>, <disp-formula>, <disp-formula-group>, <disp-quote>, <edition>, <elocation-id>, <email>, <fax>, <fig-group>, <fn-group>, <fpage>, <glossary>, <gov>, <graphic>, <inline-formula>, <inline-graphic>, <inline-supplementary-material>, <institution>, <isbn>, <issue>, <issue-id>, <issue-part>, <issue-title>, <long-desc>, <lpage>, <media>, <milestone-end>, <milestone-start>, <month>, <name>, <non-normative-note>, <object-id>, <p>, <page-range>, <patent>, <phone>, <prefix>, <price>, <ref>, <ref-list>, <related-object>, <role>, <season>, <series>, <sig>, <sig-block>, <source>, <speaker>, <speech>, <statement>, <std>, <string-name>, <subtitle>, <suffix>, <supplementary-material>, <table>, <table-wrap>, <table-wrap-group>, <tbody>, <td>, <tfoot>, <th>, <thead>, <title>, <tr>, <trans-source>, <trans-title>, <uri>, <verse-group>, <verse-line>, <volume>, <volume-id>, <volume-series>, <year>

Value	Meaning
Data characters	Text, numbers, or special characters.
Restriction: This attribute may be specified if the element is used.