Represents the "CIDSet" entry of the font descriptor object.

It is an optional entry defined as part of the PDF 1.0 specification. It was deprecated in PDF 2.0.

It contains a StreamElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 122, page 281.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 120, page 341.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 124, page 285.

CIDSet is a stream whose body is a bit array. Bit N of the array, counting from the most significant bit of the first byte, indicates whether CID N is present in the font subset. A set bit means the CID is present.

This entry is required in PDF/A conformance levels that require embedded subset fonts to declare their CID coverage.