def sdk_version(self, value):
        """The sdk_version property.
        
        Args:
            value (string). the property value.
        """
        if value == self._defaults['ai.internal.sdkVersion'] and 'ai.internal.sdkVersion' in self._values:
            del self._values['ai.internal.sdkVersion']
        else:
            self._values['ai.internal.sdkVersion'] = value