To obtain a font set, specify a base font list and an optional font list element tag.
If the tag is present, it should be preceded by a : (colon) instead of an = (equal sign).
If the tag is not present, the colon must still be present as this is what distinguishes a font from a font set in the resource declaration.
Fonts specified in the base font list are separated by a ; (semicolon). Entries specifying more than one font set are separated by a , (comma).