Except returns a compatability decomposer, except for the compatibility mapping types given here.

Extend returns a canonical decomposer, extended with the compatibility mapping types given here, to create a new compatibility decomposer.

Map returns the decomposition mapping type and mappings for a single input rune.

New returns a new Decomposer that performs a decomposition, but only for certain decomposition types.

Canonical.

Otherwise unspecified compatibility character.

Encircled form.

Final presentation form (Arabic).

Font variant (for example, a blackletter form).

Vulgar fraction form.

Initial presentation form (Arabic).

Isolated presentation form (Arabic).

Medial presentation form (Arabic).

Narrow (or hankaku) compatibility character.

No-break version of a space or hyphen.

Small variant form (CNS compatibility).

CJK squared font variant.

Subscript form.

Superscript form.

Vertical layout presentation form.

Wide (or zenkaku) compatibility character.

CD is a Decomposer that performs a canonical decomposition.

KD is a Decomposer that performs a compatibility decomposition.

Decomposer performs a full recursive decomposition of an input then applies the canonical reordering algorithm.

Type is the compatibility formatting tag that controls decomposition mapping.