# UnknownRetentionPolicy

## class nominal.core.UnknownRetentionPolicy(type)

Bases: [`object`](https://docs.python.org/3/builtins/functions.html#object "(in Python v3.15)")

A policy of a type this client version does not recognize, such as one added to the server after this release.

It can be read but not applied: [`Dataset.set_retention_policy`](https://dev.nominal.io/python/ref/generated/nominal.core.Dataset.md#nominal.core.Dataset.set_retention_policy "nominal.core.Dataset.set_retention_policy") rejects it.

### type: str

The server’s name for the policy type.