Added a way to read the nodes [skip CI]
Added a way to read the nodes [skip CI]


Former-commit-id: 600ddc89479947822ded91b2cf58f9f39792eaf4 [formerly b5ed9480f0cf7addfc8fb15e77ed48501f09ee6b]
Former-commit-id: 0e9de82d1008bb0d184cd041bdc6c53a4fd67f13
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine