In the ideal case, a large organization or SDO would define a widely-applicable set of [ModuleClasses](SDT_Components.md#ModuleClass), each of which could be used as needed to compose the description of a complex device. In order to show the appoach, this section will create a few example ModuleClasses based on - or inspired by - featues in the Echonet Lite protocol. Please note that the examples shown in this document are very "cut down" and by no means represent a true representation of Echonet Lite.
The Echonet Consortium has standardized their specifications within IEC/ISO (IEC62394, ISO/IEC24767-1, ISO/IEC24767-2, IEC62480, ISO/IEC14543-4-1, ISO/IEC14543-4-2, IEC62457) and they provide a comprehensive collection of various types of home appliances relevant to SmartGrid applications as ECHONET Device objects (see [https://echonet.jp/spec_object_rf_en/](https://echonet.jp/spec_object_rf_en/) ).
For the example in this document, to show re-use of ModuleClass definitions, two complex devices are chosen which have some common features and hence could be expected to both use some of the same ModuleClasses: an air conditioner and a washing machine.
<tr><td>measuredCumulativePowerConsumption</td><td>the cumulative power consumption</td><td>the cumulative power consumption</td></tr>
<tr><td>installationLocation</td><td>this sets/reads a string text describing the location (room) of the air-conditioner.</td><td>this sets/reads a string text describing the location (room) of the washing machine.</td></tr>
<tr><td>setTimer</td><td>(not applicable. there is no preset start for an air-conditioner)</td><td>This sets/reads use the on/off timer</td></tr>
</table>
Based on the simplified example above, the two appliances will need the ModuleClasses below:
<Doc>This indicates cumulative power consumption of the device in increments of 0.001kWh.</Doc>
<DataType>
<SimpleType type="integer"/>
</DataType>
</DataPoint>
</Data>
</ModuleClass>
<ModuleClass name="onTimerSetting">
<DataPoint name="onTimer" writable="true">
<Doc>Timer value (HH:MM)</Doc>
<DataType>
<SimpleType type="time"/>
</DataType>
</DataPoint>
</ModuleClass>
</Modules>
</Domain>
---
<a name="mseeb"></a>
### Multi Socket Electrical-Extension-Block
[mseeb.xml](../test/mseeb.xml)
This example is a specification for an imaginged device, a connected extension block with multiple power socket where each of the sockets are modeled as a
