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Prevent delete cascade on multiply referenced child items

  • reassign?
  • deletion of elements should not be possible anymore, only de-referencing
  • if a now dereferenced element is nowhere else referenced, add it as alternative root reference to base schema refernce
  • only nonterminals are prevented from deletion, not grammars?

(from redmine: issue id 563, created on 2018-01-22tgradl)

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