Represents the "ShadingType" entry of the shading dictionary
object.
It is a required entry defined as part of the PDF 1.0
specification.
It contains an integer representing a PDF numeric object.
This item may take one of the following valid values:.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 78,
page 183.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 77, page 227.
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