Organisation contract implementing SecurityLibrary

import "ITokenLedger.sol";
import "ProposalsLibrary.sol";
import "SecurityLibrary.sol";

contract Organisation
{
  ITokenLedger public tokenLedger;
  using ProposalsLibrary for address;
  using SecurityLibrary for address;
  address public eternalStorage;

  function Organisation(address _tokenLedger, address _eternalStorage) {
    tokenLedger = ITokenLedger(_tokenLedger);
    eternalStorage = _eternalStorage;
  }

  modifier onlyAdmins {
    if (!eternalStorage.isUserAdmin(msg.sender)) throw;
    _
  }

  function addProposal(bytes32 _name)
  onlyAdmins
  {
    eternalStorage.addProposal(_name);
  }
  
  [...]
}