xsd:string An Agent changes a Part of a complex entity with regard to some Feature in order to achieve some Imposed_purpose affected by the Feature. The complex entity is often a device or mechanism, but may also be an abstract entity such as the economy. Also, the full entity may be used in place of the Part. I need to adjust the thermostat to around 80 degrees when she visits. It didn't work the first time , so she had to tweak the oven a little . Greenspan expressed confidence that the current calibration of interest rates was not an overcompensation .