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--- root1: { presence: required, structure: { field1: { presence: required, value: [X, Y, Z], comment: "field 1 description" } }} root2: { presence: required, structure: { field2: { presence: required, value: [X, Y, Z], comment: "field 1 description" } }} root3: { presence: required, structure: { field3: { presence: required, value: [X, Y, Z], comment: "field 1 description" } }} ...