anchor.diff:  
   In this example, addon changes are aligned to the start of the bundle, changes to the `SpecialDiscount` price list are aligned to that change and everything else aligns to the start of the subscription.
   
  +For more information on `Plan Change Phase Alignment`, and in particular to understand how that works with apis (Subscription create or Subscription Change Plan) that specify a target `PhaseType`, you can also refer to this http://docs.killbill.io/latest/plan_alignment.html[documentation].
  +
  +
   ====== Plan Change Price List Choice
   
   This rule uses the Change Context and specifies which pricelist should be chosen for specific changes. The rule allows us to configure whether a price list is "sticky" or not.
  
positive.code: </priceList>
  ----
  
  ==== Catalog Versions
  
  This far in the discussion we have been considering single stand-alone catalogs, but Kill Bill allows the catalog to be modified over time. This is done by creating a set of catalogs with effectiveDates through time.
  
negative.code: </createAlignment>
  ----
  
  For more information on `Plan Creation Phase Alignment`, and in particular to understand how that works with apis (Subscription create or Subscription Change Plan) that specify a target `PhaseType`, you can also refer to this http://docs.killbill.io/latest/plan_alignment.html[documentation].
  
  
  ====== Plan Cancellation Timing
  
  This rule uses the Phase Context and is used to specify when a cancellation should occur.
  