The UNICODE directive defines all single-byte codepoints in the character set. The relevant syntactic characters in the character set that must be defined are those that have the Unicode codepoints of 0020 (Space), 0022 (Quotation Mark), 0027 (Apostrophe), and 002F (Slash), and 001A (the Substitute control character). In addition, all characters that are valid in a TDP identifier must be defined.