The number and any prefix word associated with, for example, the title or the caption of a <fig>, such as “Figure 3.” or “Exhibit 2.”. This element is also used for the number or symbol used as a prefix character for a footnote and placed at the place of the footnote reference.
This element can be used to preserve the prefix number or label of an element, for example, for a reference or citation “25.” or “[Lapeyre 2002]”. This can be useful when reconstructing untagged cross references.
<!ELEMENT label (#PCDATA %label-elements;)* >
(#PCDATA | email | ext-link | uri | inline-supplementary-material | related-article | related-object | hr | bold | italic | monospace | overline | overline-start | overline-end | roman | sans-serif | sc | strike | underline | underline-start | underline-end | alternatives | inline-graphic | private-char | chem-struct | inline-formula | tex-math | mml:math | abbrev | milestone-end | milestone-start | named-content | styled-content | fn | target | xref | sub | sup | x | break)*
Any combination of:
<abstract>, <ack>, <address>, <aff>, <app>, <app-group>, <array>, <author-notes>, <back>, <bio>, <boxed-text>, <chem-struct>, <chem-struct-wrap>, <corresp>, <def-item>, <def-list>, <disp-formula>, <disp-formula-group>, <disp-quote>, <element-citation>, <fig>, <fig-group>, <fn>, <fn-group>, <glossary>, <graphic>, <kwd-group>, <list>, <list-item>, <media>, <mixed-citation>, <note>, <notes>, <product>, <ref>, <ref-list>, <related-article>, <related-object>, <sec>, <statement>, <supplementary-material>, <table-wrap>, <table-wrap-foot>, <table-wrap-group>, <textual-form>, <trans-abstract>, <verse-group>
In a mixed-style bibliographic reference (punctuation and spacing preserved):
<article> <front>...</front> <body> ... <p>... Although there is considerable descriptive literature on day hospital care,<xref ref-type="bibr" rid="B1">1</xref> concern has been expressed that evidence for effectiveness is equivocal and that day hospital care is expensive.<xref ref-type="bibr" rid="B2">2</xref> ...</p> ... </body> <back>... <ref-list> <ref id="B1"><label>1</label> <mixed-citation publication-type="book"> <collab>Research Unit of the Royal College of Physicians and British Geriatric Society</collab>. <source>Geriatric day hospitals: their role and guidelines for good practice</source>. <publisher-loc>London</publisher-loc>: <publisher-name>RCP</publisher-name>; <year>1994</year>. </mixed-citation> </ref> <ref id="B2">...</ref> ... </ref-list> ... </back> </article>