Refactor XML schema import and reoccurring elements
- Reference tree should stop from being created once we run into a cycle (register once more, then stop)
- Cycle tree could be taken from the original tree and saved as independent subtree (major change?)
- Nonterminals are imported only once now (what are the side-effects, how to show in UI?)
- ComplexContent (see e.g. KML Schema) seems not to be imported
Tasks:
- Rework completely
- Write unit tests
(from redmine: issue id 766, created on 2018-01-22tgradl)
- Relations:
- relates #543
- relates #864