8.12.2.20 IfcTextFontName
8.12.2.20.1 Semantic definition
The IfcTextFontName is a list of font family names and/or generic family name.
Values of 
- '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.
 
8.12.2.20.2 Formal representation
TYPE IfcTextFontName = STRING;
END_TYPE;