Object Identifier

Used to record an identifier, such as a DOI, for elements other than the top-level element <article>


Such an identifier may be created by a publisher or archive, and there is no requirement that identifiers be unique.

Design Note: An element, rather than an attribute, was chosen as the means to capture DOIs and other identifiers so multiple identifiers could be retained.


content-type Type of Content
pub-id-type Type of Publication Identifier

Content Model

<!ELEMENT  object-id    (#PCDATA)                                    >


Text, numbers, or special characters

This element may be contained in:

<boxed-text>, <chem-struct>, <chem-struct-wrap>, <element-citation>, <fig>, <graphic>, <media>, <mixed-citation>, <product>, <related-article>, <related-object>, <supplementary-material>, <table-wrap>


<sec sec-type="results">
<p>We identified 703 abstracts, of which 687 were not
relevant ... Details of randomisation procedures,
treatment schedules, and numbers of patients followed
up are given on the <italic>BMJ</italic> website.</p>
<fig id="F1">
<title>Deaths among patients receiving day hospital care
or alternative services.</title>
<p>Odds ratios of death by end
of follow up were calculated by fixed effects model.
Heterogeneity between trials is presented as
<alt-text>Deaths in hospitals or with alternative services</alt-text>
<graphic xmlns:xlink="http://www.w3.org/1999/xlink"
xlink:href="fors2662.f1"  >