def is_reference(self, value):
    return isinstance(value, basestring) and value.startswith('${')
Creates the structure of the model
dataset/ETHPy150Open spinnaker/spinnaker/pylib/spinnaker/validate_configuration.py/ValidateConfig.is_reference--crossover with--dataset/ETHPy150Open RJT1990/pyflux/pyflux/garch/egarch.py/EGARCH.model