Represents the "BaseFont" entry of the type 1 font 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.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 111, page 254.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 109, page 310.

For the 14 standard Type1 fonts this value is one of the well-known names such as Helvetica, Times-Roman, or Courier. For other fonts it is the PostScript name of the font, which may include a subset tag prefix of the form ABCDEF+PostScriptName when the font is embedded as a subset.

Viewers use this name to locate the font in the system or embedded resources. If the font is not embedded and the name does not match a standard font, the viewer may substitute a similar font.