# `•uuid` — UUIDs

`•uuid v` returns a new UUID of version `v` as text. Version 4 is
random. Version 7 UUIDs begin with their creation time and sort in
creation order. Version 0 is the nil UUID, with every digit zero.
Versions 1 and 6 also hold the time, with a random node in place of a
MAC address.

`[ns name] •uuid 5` derives a UUID from a name with SHA-1, and
`[ns name] •uuid 3` with MD5. `ns` is `"dns"`, `"url"`, `"oid"`,
`"x500"` or a UUID. The same namespace and name always give the same
UUID. `bytes •uuid 8` makes a UUID from 16 bytes, and sets its version
and variant.

``` bpl
"dns" "python.org" •uuid 5   ⍝ "886313e1-3b8a-5372-9b90-0c9aee199e5d"
```

Errors: `DOMAIN` for any other version, or a left argument that doesn’t
fit the version.