Unique identifier (such as a DOI or URI) for a component within a document such as a standard or a journal article (for example, for a figure, table, or text box within a standard).
These identifiers may be created by a standards organization, publisher, or archive, and there is no requirement that identifiers be unique.
Design Note: Particularly in citations, an <object-id> is used to identify parts of a document, for example, a particular section, a figure, a table, or even a specific citation (as an entity) in the document’s reference list. The <pub-id> element may be used inside a citation to identify a cited publication.
Text, numbers, or special characters
This element may be contained in:
... <fig id="F1"> <caption> <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 χ<sup>2</sup></p> </caption> <alt-text>Deaths in hospitals or with alternative services</alt-text> <graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="fors2662.f1"> <object-id pub-id-type="pii">456472</object-id> </graphic> </fig> ...