Documentation-of-the-Knowledge-Graph.md

@@ -35,3 +35,14 @@ The production line is described according to the pattern of the figure below:
 
 ![production-line-overview.svg](uploads/1ba22c893448c4654d159413bad3977b/production-line-overview.svg)
 
+In practice, the blank nodes will have a specific identifier, and it may be typed with a different class than what is shown in the diagram above. However, a class hierarchy can help inferring that a given entity is of the appropriate type. For instance, here is a piece of the description of the IT'm Factory:
+
+```
+itm:itm a sosa:Platform;
+   sosa:hosts itm:productionLine .
+itm:productionLine onto:inputMachine itm:vl10;
+   ssn:hasSubSystem itm:dx10;
+   ssn:hasSubSystem itm:bosch-apas;
+   onto:outputMachine itm:xy10 .
+itm:vl10 a onto:VL10 .
+```
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