ACL's using SQL Backend

I don't want to use vfile as the acl backend.

I want to use sql, but it seems to be sparsely documented.  Would this work?

create table acls (

  acl_name varchar(255) not null,

  username varchar(320) not null default '',

  acl_value varchar not null,

  constraint acls_pk primary key (acl_name, username)

);

map { pattern = $key table = acls fields { acl_name = $key } username_field = username value_field = acl_value }

Thanks.

Joseph D. Wagner