Understanding the conceptual model

The control data model in XMPP is very simple. Each device just consists of a set of control parameters. When we introduce nodes in later chapters and allow our devices to be divided into nodes, we can allow each controllable node to have its own set of control parameters:

Figure 2. Conceptual model of control parameters in XMPP

As with sensor data, there are different kinds of control parameters that can be represented in this model. They all share the common parameters presented in Figure 2, but represent the corresponding control value differently:

Representation	Description
String	Value encoded as `xsd:string`.
Boolean	Value encoded as `xsd:boolean`.
Color	Value encoded as a six- or eight-character hexadecimal string in the format RRGGBB or RRGGBBAA.
Date	Value encoded as `xsd:date`.
DateTime	Value encoded as `xsd:dateTime`.
Double	Value encoded as `xsd:double`.
Duration	Value encoded as `xsd:duration`.
Int32	Value encoded as `xsd:int`.
Int64	Value encoded as `xsd:long`.
Time	Value encoded as `xsd:time`.

Parameter classes for the different control parameters are defined in the Waher.Things.ControlParameters namespace.

Table of Contents for Understanding the conceptual model

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Table of Contents for
Understanding the conceptual model