# Unsupported Features

The keywords `readOnly` and `writeOnly` are not supported.

The keyword `contentMediaType` and `contentEncoding` are just for annotation and
will not be used for validation.

The following `format` checks are not supported:
+ `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`