Represents the "S" entry of the action dictionary object.

It is a required entry defined as part of the PDF 1.0 specification.

It contains a string representing a PDF name object.

This item may take one of the following valid values:.

• GoTo
• GoToR
• GoToE
• Launch
• Thread
• URI
• Sound
• Movie
• Hide
• Named
• SubmitForm
• ResetForm
• ImportData
• JavaScript
• SetOCGState
• Rendition
• Trans
• GoTo3DView
• RichMediaExecute
• GoToDp

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 193, page 414.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 196, page 502.