Publication Identifier for a Cited Publication


The identifier of a publication, such as a related journal article, that is listed within a <citation> or <nlm-citation> inside an article’s <ref-list>


The pub-id-type attribute is used either to identify the type of identifier, or to name the authority, organization, or system that defined this identifier, for example identifying a DOI, Medline identifier, PII, the publisher’s identifier, etc. (See pub-id-type for values.)

For extensive examples of formatted <nlm-citation>s including use of <pub-id>s in <nlm-citation>s, see: Sample PubMed Central Citations. To see tagged versions of these examples, see: Sample PubMed Central Citations - XML Tagged.


pub-id-type Type of Publication Identifier

Model Information

Content Model

<!ELEMENT  pub-id       (#PCDATA)                                    >


Text, numbers, or special characters

This element may be contained in:

<citation> Citation; <nlm-citation> NLM Citation Model; <product> Product Information; <related-article> Related Article Information

Tagged Example

<ref id="B8">
<article-title>Effects and costs of day-care services 
for the chronically ill: a randomized 
<source>Medical Care</source>
<pub-id pub-id-type="pmid">6772889</pub-id>