9 A **User** represents a person who interacts with Arvados via an ApiClient.
13 See "users":{{site.baseurl}}/api/methods/users.html
17 Each User has, in addition to the usual "attributes of Arvados resources":{{site.baseurl}}/api/resources.html:
19 table(table table-bordered table-condensed).
20 |_. Attribute|_. Type|_. Description|_. Example|
22 |username|string|The username used for the user's git repositories and virtual machine logins. Usernames must start with a letter, and contain only alphanumerics. When a new user is created, a default username is set from their e-mail address. Only administrators may change the username.||
25 |identity_url|string|||
28 |default_owner_uuid|string|||
30 |writable_by|array|List of UUID strings identifying Groups and other Users that can modify this User object. This will include the user's owner_uuid and, for administrators and users requesting their own User object, the requesting user's UUID.||