Represents the "Direction" entry of the collection split dictionary object.

It is an optional entry defined as part of the PDF 1.7 Extension Level 3 specification.

It contains a string representing a PDF name object.

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

• H
• V
• N

For definitive details see:.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 8.6b, page 31.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 158, page 450.

The direction name selects whether the split between the file list and the detail pane is horizontal (H) or vertical (V).