Represents the "V" entry of the collection field dictionary object.

It is an optional entry defined as part of the PDF 1.0 specification.

It contains a bool representing a PDF boolean object.

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

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 157, page 372.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 8.8, page 30.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 155, page 448.

The visibility flag controls whether this column is shown in the portfolio's default view. When false the column exists in the schema but is hidden from the user unless explicitly revealed.