Represents the "Zoom" entry of the optional content usage dictionary object.

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

It contains an OptionalContentUsageZoomElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 102, page 232.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 100, page 285.

The Zoom sub-dictionary defines a magnification range for this group. It contains min and max entries giving the lower and upper magnification bounds. A viewer may turn the group off when the current zoom falls outside the range.