- xml_basechar(+CodeOrChar) is semidet
- xml_ideographic(+CodeOrChar) is semidet
- xml_combining_char(+CodeOrChar) is semidet
- xml_digit(+CodeOrChar) is semidet
- xml_extender(+CodeOrChar) is semidet
- XML character classification predicates. Each of these predicates accept both a character (one-character atom) and a code (integer).