Represents the "C" entry of the richmediacommand dictionary object.

It is a required entry defined as part of the PDF 1.7 Extension Level 3 specification.

It contains a string representing a PDF string object.

For definitive details see:.

Adobe Supplement to the ISO 32000, BaseVersion: 1.7, ExtensionLevel: 3; Table: 8.48b, page 41.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 223, page 524.

The command name string identifies the operation to execute in the rich media player. Valid command names depend on the media type and the player's exposed API.