Represents the "DPM" entry of the dpart dictionary object.

It is an optional entry defined as part of the PDF 2.0 specification.

It contains an Element.

For definitive details see:.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 409, page 830.

The DPM entry holds a document part metadata dictionary with application-specific properties for this part. Its contents are defined by the workflow or specification using the hierarchy, not by PDF itself.