In some instances a canonical decomposition or a compatibility decomposition may consist of a single character. For a canonical decomposition, this indicates that the character is a canonical equivalent of another single character. For a compatibility decomposition, this indicates that the character is a compatibility equivalent of another single character.
The compatibility formatting tags used are:
| Tag | Meaning |
|---|---|
| <font> | A font variant (e.g. a blackletter form) |
| <noBreak> | A no-break version of a space or hyphen |
| <initial> | An initial presentation form (Arabic) |
| <medial> | A medial presentation form (Arabic) |
| <final> | A final presentation form (Arabic) |
| <isolated> | An isolated presentation form (Arabic) |
| <circle> | An encircled form |
| <super> | A superscript form |
| <sub> | A subscript form |
| <vertical> | A vertical layout presentation form |
| <wide> | A wide (or zenkaku) compatibility character |
| <narrow> | A narrow (or hankaku) compatibility character |
| <small> | A small variant form (CNS compatibility) |
| <square> | A CJK squared font variant |
| <fraction> | A vulgar fraction form |
| <compat> | Otherwise unspecified compatibility character |