control code set is defined for bibliographic applications such as library systems. It is mostly concerned with string collation, and with markup of bibliographic fields. Slightly different variants are defined in the German standard DIN 31626 (published in 1978 and since withdrawn) and the ISO standard ISO 6630, the latter of which has also been adopted in Germany as DIN ISO 6630. Where these differ is noted in the table below where applicable. MARC-8 uses the coding of and from this set, and adds some additional format effectors in locations not used by the ISO version; however, MARC 21 uses this control set only in MARC-8 records, not in Unicode-format records. If using the ISO/IEC 2022 extension mechanism, the DIN 31626 set is designated as the active C1 control character set with the sequence 0x1B 0x22 0x45 (ESC " E), and the ISO 6630 / DIN ISO 6630 set is designated with the sequence 0x1B 0x22 0x42 (ESC " B). The 1985 expansion of the ISO 6630 set can also be explicitly specified by using the sequence 0x1B 0x26 0x40 0x1B 0x22 0x42 (ESC & @ ESC " B). Other C1 control code sets EBCDIC defines 16 additional control codes, besides those present in ASCII. When mapped to Unicode or to ISO 8859, these codes are mapped to C1 control characters in a manner specified by IBM's Character Data Representation Architecture (CDRA). Although the default mapping of the New Line (NL) control does correspond to the ISO/IEC 6429 (0x85; although its mapping is sometimes swapped with LF, following UNIX line ending convention), the remainder of the control codes do not correspond to ISO/IEC 6429. For example, the EBCDIC control (0x09, mapped to 0x8D) and the ECMA-48 control (0x8C) are both used to begin a superscript or end a subscript, but are not mapped to one another. Extended-ASCII-mapped EBCDIC can therefore be regarded as having its own C1 set, although it is not registered with the ISO-IR registry for use with ISO/IEC 2022. Various specialised C1 control code sets are registered for use by various Videotex formats. Unicode Unicode sets aside 65 code points in the general category (control) for compatibility with ISO/IEC 2022. These are: U+0000–U+001F (C0 controls) and U+007F (delete) assigned to the Basic Latin block, and U+0080–U+009F (C1 controls) assigned to the Latin-1 Supplement block. Unicode only specifies semantics for U+0009–U+000D, U+001C–U+001F, and U+0085. The rest of the