Elastographic imaging of heart tissue may be used to provide strain images by mapping strain magnitude to brightness and strain sign to hue and thus provide improved clinical indication of compression and distension of heart muscle. The XML system includes a computer system having a memory subsystem, a communication interface operatively coupled to a network, an XML processor configured to receive and process the XML input data stream, and an extensible stylesheet language transformation processor configured to either obtain a stylesheet identified in the XML data stream or obtain the stylesheet from a stylesheet repository. The control circuitry, including associated microprocessors devices, interact to selectively activate communication circuits to perform necessary communication or data processing functions and enter and remain in a power-saving dormant state during other times. The error variable values and the data structure are used to determine an error correction operation with respect to at least one of the first level component and the connected second level component. Depending on the configuration of the RAU, the power-consuming RAU modules andor external power-consuming devices may demand more power than is available at the RAU. Finally, the sulfide compounds are removed from the second reactor in a stripping system, and converted to elemental sulfur in an adsorber.