{"source_variable_1": {"type": "variable", "default": "val1", "properties": [{"type": "type", "name": "string"}, {"type": "mode", "name": "standard"}, {"type": "property", "name": "mandatory"}], "paths": ["source_variable_1"], "names": ["source_variable_1"], "descriptions": ["The first source variable."]}, "source_variable_2": {"type": "variable", "default": "val2", "properties": [{"type": "type", "name": "string"}, {"type": "mode", "name": "standard"}, {"type": "property", "name": "mandatory"}], "paths": ["source_variable_2"], "names": ["source_variable_2"], "descriptions": ["The second source variable."]}, "my_variable": {"type": "variable", "default": "val1", "properties": [{"type": "type", "name": "choice"}, {"type": "mode", "name": "standard"}, {"type": "property", "name": "mandatory"}], "choices": ["the value of the variable \"source_variable_1\".", "the value of the variable \"source_variable_2\"."], "paths": ["my_variable"], "names": ["my_variable"], "descriptions": ["A variable."]}}