516e2105_ccess_Control_List____UnixRock__Compact_Access_Privilege
[Access Privilege] write_xattr [Description] Permission to create extended attributes or write to the extended attributes directory.Granting this permission to a user means that the user can create an extended attribute directory for a file. The attribute file's permissions control the user's access to the attribute. [Compact Access Privilege] 
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Administration of Solaris ACL (Access Control List) - UnixRock
Compact Access Privilege