This class represents the printer's mark annotation. This is definitively detailed in:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 362, page 632.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 398, page 812.

This class is always an indirect object because it inherits from AnnotationElement which is always an indirect object.

A printer mark annotation identifies a region of a PDF page containing a printer mark such as a registration target, color bar, or crop mark, used in prepress workflows to align separations and verify color accuracy.

The MN entry holds a name identifying the specific mark type, allowing prepress tools to locate marks without analysing their appearance streams.

These annotations appear outside the TrimBox, in the bleed area of the page.

System.Object
    WebSupergoo.ABCpdf14.Elements.Element
       WebSupergoo.ABCpdf14.Elements.AnnotationElement
          WebSupergoo.ABCpdf14.Elements.PrintersMarkAnnotationElement