add last mapping sentence

TS-0041-oneM2M-SensorThings_interworking.md

@@ -204,6 +204,9 @@ The OGC/STA data model is a relational one, as used in databases, and not hierar
   <figcaption>Figure 6.1-1: OGC data model cannot directly be mapped to oneM2M</figcaption>
 </figure>
 
+The SensorThings data model is comprehensive and may be regarded as a n:m relational database structure, holding both:
+- sensor (IoT-data); and 
+- administrative data (like historic locations or historic products IDs).
 
 <mark>The following text is to be used when appropriate:</mark>