The function character names and classes (RE, RS, SPACE, FUNCHAR, SEPCHAR, MSOCHAR, MSICHAR and MSSCHAR) in the FUNCTION part of the SGML Declaration must each be followed by a character number.

#0105   Markup Error

ISO 8879, 13.4.4

The function character names and classes (RE, RS, SPACE, FUNCHAR, SEPCHAR, MSOCHAR, MSICHAR and MSSCHAR) in the FUNCTION part of the SGML Declaration must each be followed by a character number.