Font metrics file path. Path and name of a font metrics file, including file suffix.
Used for Adobe Type 1 fonts. If not specified, the server will attempt to find a font metrics file in the same folder in which the principal font file is located. An error will occur if a required font metrics file cannot be found at render time.
Text string. Optional for Adobe Type 1 files. Must be empty or a valid Image Server file path, either absolute or relative to attribute::RootPath .