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 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>