{
    "id1-1": { "or": ["email", "positive_integer" ] },
    "id2-1": [{ "or": ["email", "positive_integer" ] }, "to_lc"],
    "id3-1": { "or": [{"min_length": 15}, ["email", "to_lc"] ] },
    "id4-1": { "or": [["required", "positive_integer"], ["not_empty", "email"] ] },


    "products": {"list_of": { "or": [
        {"nested_object": {
            "product_type": ["required", {"eq": "material"}],
            "material_id": ["required", "positive_integer"],
            "quantity": ["required", {"min_number": 1} ],
            "warehouse_id": "positive_integer"
        }},

        {"nested_object": {
            "product_type": ["required", {"eq": "service"}],
            "name": ["required", {"max_length": 20} ]
        }}
    ]}}
}