Represents the "Count" entry of the outline dictionary object.

It is defined as part of the PDF 1.0 specification.

It contains an integer representing a PDF numeric object.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 152, page 368.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 150, page 442.

The count is the total number of open outline items at all levels of the tree. Viewers may use this to allocate display space for the outline.