The ID of this right. This is a unique identifier.
The type of the grantee. Valid values are:
The role granted by this right. The following are currently allowed:
A displayable name for users, groups or invitations. In case of invitations the email address is given.
The email address of the user or invitation to which this permission refers. There is no email field for groups.
A link to the user's avatar image. This is only provided for users, not groups and invitations.