Commit f86986ae authored by Peter Waher's avatar Peter Waher

Adding PNG file.

parent 87adbddd
......@@ -14,7 +14,7 @@ Conceptual model
The XML representation of Sensor Data used by the IEEE XMPP IoT interfaces is based on a three or four level abstraction:
![Conceptual model](
![Conceptual model](
Either the **device** is a simple device, with one identity, or it consists of a set of **nodes**. The later is also sometimes referred
to as a **concentrator**, as it *concentrates* several nodes, or virtual devices, into one entity. Each device then report a set of **fields**,
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