Represents the "Subtype" entry of the devicen colour space attributes dictionary object.

It is an optional entry defined as part of the PDF 1.6 specification.

It contains a string representing a PDF name object.

The PDF specification states that this item assumes a value of "DeviceN" if no value has been provided.

This item may take one of the following valid values:.

• DeviceN
• NChannel

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 71, page 161.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 70, page 203.