Merge branch 'dev-daniel' into 'develop'

Dev daniel

See merge request d-ptb/d-si/xsd-d-si!29

wiki/doc/RealQuantity.md

@@ -15,6 +15,9 @@
 <img alt="D-SI-Image-1.7" width="600" style="border-width:10" src="wiki/doc/D-SI-1.7.PNG" /></a>
 ---
 <img alt="D-SI-Image-1.8" width="600" style="border-width:10" src="wiki/doc/D-SI-1.8.PNG" /></a>
+
+*Remark: It is in the responsibility of the creator of data to provide correct and consitent values for the expanded uncertianty, the coverage factor and the coverage probability. In case of inconsisten data, the value for the coverage factor should be seen as the "point of truth" in the data.*
+
 <img alt="D-SI-Image-1.9" width="600" style="border-width:10" src="wiki/doc/D-SI-1.9.PNG" /></a>
 ---
 <img alt="D-SI-Image-1.10" width="600" style="border-width:10" src="wiki/doc/D-SI-1.10.PNG" /></a>

wiki/doc/UnitSystem.md

@@ -111,6 +111,12 @@ Description how to build units witht the D-SI format is [here](StructureSIUnits.
 |\zebi|gold|zebi |Zi|1180591620717411303424|[1, p. 143]|
 |\yobi|gold|yobi |Yi|1208925819614629174706176|[1, p. 143]|"
 
+## Operators for combining units
+|D-SI Identifyer|Description|Examples|D-SI Medal |
+|-:|-:|-:|-:|
+| |Multiplication: simply append one unit to another |\metre\metre|PLATINUM|
+|\tothe{n} | Exponent: following a unit where n is an integer or (+-)0.5 |\metre\tothe{2}, \volt\tothe{-0.5}|PLATINUM|
+|\per |Division: All units on the left side of the operator devided by all units on its right side |\metre\per\metre|SILVER|
 
 ### References