While it is often called a "plate number", it does not always contain numbers. The facs attribute may be used to record the location of the plate number in a facsimile image.
<elementSpec ident="plateNum" module="MEI.header">
<gloss versionDate="2022-05-18" xml:lang="en">plate number</gloss>
<desc xml:lang="en">Designation assigned to a resource by a music publisher, usually printed
at the bottom of each page, and sometimes appearing also on the title page.</desc>
<classes>
<memberOf key="att.common"/>
<memberOf key="att.bibl"/>
<memberOf key="att.facsimile"/>
<memberOf key="att.lang"/>
<memberOf key="model.physDescPart"/>
<memberOf key="model.titlePagePart"/>
</classes>
<remarks xml:lang="en">
<p>While it is often called a "plate number", it does not always contain numbers. The
<att>facs</att> attribute may be used to record the location of the plate number in a
facsimile image.</p>
</remarks>
</elementSpec>