&reftitle.constants;

The following constants define the normalization form used by the normalizer:

`Normalizer::FORM_C` (`string`)

- Normalization Form C (NFC) - Canonical Decomposition followed by Canonical Composition

`Normalizer::FORM_D` (`string`)

- Normalization Form D (NFD) - Canonical Decomposition

`Normalizer::FORM_KC` (`string`)

- Normalization Form KC (NFKC) - Compatibility Decomposition, followed by Canonical Composition

`Normalizer::FORM_KD` (`string`)

- Normalization Form KD (NFKD) - Compatibility Decomposition

`Normalizer::NONE` (`string`)

- No decomposition/composition

`Normalizer::OPTION_DEFAULT` (`string`)

- Default normalization options