code: def _getPropertyValue(schema, propertyName, options):
    
  
    if propertyName not in options:
      paramsSchema = schema['properties'][propertyName]
      if 'default' in paramsSchema:
        options[propertyName] = paramsSchema['default']
      else:
        options[propertyName] = None
docs: Checks to see if property is specified in 'options'. If not, reads the
    default value from the schema