String ::= UTF8String (FROM (
{0,0,0,9} -- TAB
| {0,0,0,10} -- CR
| {0,0,0,13} -- LF
| {0,0,0,32}..{0,0,215,255} -- Space to the start of the S-zone
| {0,0,224,0}..{0,0,255,253} -- Rest of BMP after S-zone
| {0,1,0,0}..{0,16,255,253} -- Other planes -- ) )