Represents the "Subtype" entry of the render mode dictionary object.

It is a required entry defined as part of the PDF 1.0 specification.

It contains a string representing a PDF name object.

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

• Solid
• SolidWireframe
• Transparent
• TransparentWireframe
• BoundingBox
• TransparentBoundingBox
• TransparentBoundingBoxOutline
• Wireframe
• ShadedWireframe
• HiddenWireframe
• Vertices
• ShadedVertices
• Illustration
• SolidOutline
• ShadedIllustration

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 307, page 527.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 318, page 659.