<pub-date> Publication Date
In ISO STS, this element holds the date on which a standard is (or was) first published. For this NISO STS Tag Set, this publishing date should be recorded using the <release-date> element.
For new documents, tagging the published date as <release-date> is considered Best Practice. The element <pub-date> should not be used as part of a standards document’s metadata.
The <pub-date> element has been retained in the ISO-related metadata elements (<iso-meta>, <reg-meta>, <nat-meta>) for purposes of backwards compatibility. This element has been placed into the models for <std-meta> and <std-doc-meta> for purposes of ISO and ISO-related organization’s future migration.
Here is a tagged example from ISO STS of the previous use of the element <pub-date>:
<iso-meta> ... <pub-date>2009-05-30</pub-date> <release-date>2009-05-30</release-date> ... </iso-meta>
Here is a NISO STS tagged example showing the <release-date> element replacing <pub-date> for initial publication and description of the current standards document:
<iso-meta> ... <release-date date-type="published" std-type="new-standard" iso-8601-date="2009-05-30">2009-05-30</release-date> <release-date date-type="published" std-type="IS" iso-8601-date="2009-05-30">2009-05-30</release-date> ... </iso-meta>