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[Eduardo César <606361@xxxxxxxxxxxxxxxxxx>]

** Project changed: oship => oshippy

** Changed in: oshippy
    Milestone: 1.5 => None

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https://bugs.launchpad.net/bugs/606361

Title:
  several issues in class Element

Status in Open Source Health Information Platform - Python:
  New

Bug description:
  Method __eq__ is not implemented correctly. It should return if two Element objects are equal according to some criterion and not whether an object is of type Element. The java implementers used equality of two elements based on the value attribute. I would prefer to use the attributes name and value. 
  It is advisable to use in the __hash__ method the same attributes used in __eq__. There are two hash(self.uid) in the method body. I'd rather remove both and use only name and value.

  There are three invariants that are not enforced in the initializer:
  Is_null_valid: is_null = (value = Void)
  Null_flavour_indicated: is_null xor null_flavour = Void
  Null_flavour_valid: is_null implies terminology(Terminology_id_openehr).has_code_for_group_id
  (Group_id_null_flavour, null_flavour.defining_code)
       Here we will have to use the internal openehr terminology service.

  In the initializer, why no call the initializer of the superclass ?