text: **4.3. Keep past and future separate**
  For the same reason why it is important to always distinguishes between political and economical 
  
  advantages (or disadvantages) of Open Data, it is necessary to keep decisions about*future*data 
  
  (those that will arrive in the future, due to new contracts, public services and so on) separate from 
  
  those about data that already exist. At the end of 2010, T. Steinberg wrote that the idea that 
  
  Government should publish everything non-private it can**now**is "rather dangerous", and that it 
  
  would be much better to release nothing until someone actually asked for it, and at that point doing 
  
  it right, that is with an open license and so on. The first reasons for Steinberg's concern is that 
  
  asking for everything as soon as possible would*"stress the system too much, by spreading thin the*
  
  *finite amount of good will, money and political capital"*. The second is that many existing old data 
  
  and data archival systems are, in practice, so uninteresting that it wouldn't make sense to spend 
  
  resources in opening them. 
  
  Even if these concerns were always true, it is important to realize that they apply (especially the 
  
  second) to already existing data, not to future ones. The two classes of data have, or can have, very 