# Unsupported

Some of the optional JSON-Schema features are not supported by JsonXema.

## Unsupported semantic validation

For now, the keyword `format` do not support the following formats:
+ `idn-email` the I18N equivalent of `email`
+ `idn-hostname` I18N equivalent of `hostname`
+ `iri` the I18N equivalent of `uri`
+ `iri-reference` the I18N equivalent of `uri-reference`