Publication Type Identifier (in a citation)
Type of publication identifier or the organization or system that defined the identifier for a non-standard citation, typically a reference to a technical report, book, journal article, etc.
This attribute is not used to name the type of cited standard for a <std>; the <std> element used the @type attribute.
... <mixed-citation publication-format="print" publication-type="report" ><collab>FCC</collab> <gov>Bulletin No. 65</gov> (<month>August</month> <year>1997</year>), <source>Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields</source>. Available at <uri>http://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet65/oet65.pdf</uri>. [Rule 420Q NOTE]</mixed-citation> ...