Type definition
The IfcTextFontName is a list of font family names and/or generic family name.
  NOTE  Definition according to Cascading Style Sheets, level 1
  Values of <family-name>: 
  The name of a font family of choice. For example, "gill" and "helvetica" are font families.
  Values of <generic-family>:
  In the example above, the last value is a generic family name. The following generic families are defined:
    
      - 'serif' (Example: Times)
 
      - 'sans-serif' (Example: Helvetica)
 
      - 'cursive' (Example: Zapf-Chancery)
 
      - 'fantasy' (Example: Western)
 
      - 'monospace' (Example: Courier)
 
    
  
It is encouraged to offer a generic font family as a last alternative.
NOTE  Type adopted from font-family defined in CSS-1.
HISTORY  New type in IFC2x2 Add2.