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- Use the **EX** style, add the letter "i" (for informative) before the number (which shall be in square brackets) and separate this from the title with a tab (you may use sequence fields for automatically numbering references).
# 3 Definition of terms, symbols and abbreviations
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# 5 Introduction to OGC SensorThings API
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The SensorThings API (STA) is a standard of the Open Geospatial Consortium (OGC). It provides a framework for communication and exchanging data between sensors and applications. The standard is devided in two parts. SensorThings API Part 1 is dedicated to sensing and was published in 2016 and updated in 2021 <ahref="#_ref_1">[1]</a>. Part 2 deals with tasking and was published in 2019 <ahref="#_ref_i.2">[i.2]</a>.
A STA-based architecture works in client/server mode. A sensor device pushes data to the SensorThings Server via HTTP. A SensorThings Server may also support MQTT protocol to support publish and subscribe capabilities. An interested application can subscribe to the MQTT-Broker, in order to get notified about new sensor events.
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<figcaption>Figure 5-1 STA message flow</figcaption>
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The data in the SensorThings server are organized as according to “Sensing Entities” (see Figure 5.0-1: “Sensing Entities” data model).
The data in the SensorThings server are organized as according to “Sensing Entities” (see Figure 5.0-1: “Sensing Entities” data model).