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TS-0041-oneM2M-SensorThings_interworking.md

@@ -139,14 +139,14 @@ The key words "Shall", "Shall not", "May", "Need not", "Should", "Should not" in
 
 # 5 Introduction to OGC SensorThings API
 
-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.    
+The SensorThings API (STA) is a standard of the Open Geospatial Consortium (OGC) <a name="_ref_1">[1]</a>. 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.    
 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.
 
 ![Figure 5-1 STA message flow](media/STA_flow.png)
 
 **Figure 5-1 STA message flow** 
 
-The data in the SensorThings server are organized as according to  **Sensing Entities** (see Figure 5-2: Sensing Entities data model.
+The data in the SensorThings server are organized as according to  **Sensing Entities** (see Figure 5-2: Sensing Entities Data Model).
 
 ![Figure 5-2 STA Sensing Entities Data Model](media/data_model.jpg)
 
@@ -165,7 +165,7 @@ The Sensing Entities data model and the purpose of data within the data model di
 
 Figure 6.0-1 shows an architecture approach for an Interworking Proxy Entity (IPE) between oneM2M and the OGC SensorThings API. The IPE is located between a oneM2M CSE and an OGC/SensorThings API (STA)-Server. 
 
-The basic interworking enables applications that are connected to an oneM2M-based system to get data from sensors that are connected to an OGC/STA server. Furthermore, an application that is connected to an OGC/STA server will be able to get data from sensors that are connected to an oneM2M-based system. The communication flow of the IPE shall rely on HTTP and MQTT. The MQTT protocol enables publish-subscribe functionality for the OGC side, as specified in the MQTT extension of the SensorThings API <a href="#_ref_i.1">[i.1]</a>.
+The basic interworking enables applications that are connected to an oneM2M-based system to get data from sensors that are connected to an OGC/STA server. Furthermore, an application that is connected to an OGC/STA server will be able to get data from sensors that are connected to an oneM2M-based system. The communication flow of the IPE shall rely on HTTP and MQTT. The MQTT protocol enables publish-subscribe functionality for the OGC side, as specified in the MQTT extension of the SensorThings API <a name="_ref_1">[1]</a>. 
 
 ![Figure 6.0-1: IPE architecture overview](media/STA_oneM2M_architekturbild_01.svg)