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1. Get the ACL of the requested resource.
   1.  if ACL exists:
      1. Find union of authorizations that specify access for the requesting user. This includes:
         1. authorizations that specify accessTo to the requested resource.
         2. authorizations that specify accessToClass of the requested resource type.
      2. Find union of authorizations that specify access for the requesting user's group. This includes:
         1. authorizations that specify accessTo to the requested resource.
         2. authorizations that specify accessToClass of the requested resource type.
      3. If authorizations exist for user or group:
         
         1. Find the union of authorizations found from steps 1.a.i and 1.a.ii.
         2. Go to step 4.
      4. if no authorization exist for user or group:
         1. Deny Access. Go to step 2.
   2. if no ACL exists for requested resource:
      1. Go to step 2.
2. Get the ACL of the next ancestor (using either ldp:contains or fedora:hasParent).
   1.  if ACL exists:
      1. Find union of authorizations that specify access for the requesting user. This includes:
         1. authorizations that specify accessTo to the requested resource.
         2. authorizations that specify accessToClass of the requested resource type.
      2. Find union of authorizations that specify access for the requesting user's group. This includes:
         1. authorizations that specify accessTo to the requested resource.
         2. authorizations that specify accessToClass of the requested resource type.
      3. If authorizations exist for user or group:
         
         1. Find the union of authorizations found from steps 2.a.i and 2.a.ii.
         2. Go to step 4.
      4. Find union of authorizations that specify access for the requesting user. This includes:
         1. authorizations that specify accessTo to the requested resource's ancestor.
      5. Find union of authorizations that specify access for the requesting user's group. This includes:
         1. authorizations that specify accessToClass of to the requested resource's ancestor.
      6. If authorizations exist for user or group:
         
         1. Find the union of authorizations found from steps 2.a.iv and 1.a.v.
         2. Go to step 4.
      7. if no authorization exist for user or group:
         1. Deny Access. Go to step 2.
   2. if no ACL exists for requested the current ancestor resource:
      1. Go to step 2.
3. If no more ancestor exist (root node reached) and no ACL or no matching authorization is found:
   1. Deny access.
4. Use the most permissive from the set of authorizations found.
   1. Grant access if the authorizations permit requested access mode (read, write, append).
   2. Deny access if the authorizations does not permit requested access mode.

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