chore: change type of "revision index" to string

io.catenax.specialCharacteristics.measurement/1.0.0/Measurement.ttl

@@ -44,8 +44,8 @@
 :revisionIndex a samm:Property ;
    samm:preferredName "Revision Index"@en ;
    samm:description "This attribute contains the revision index of the special characteristic, it is necessary to identify a special characteristic"@en ;
-   samm:characteristic :CharacteristicRevisionIndex ;
-   samm:exampleValue "01"^^xsd:positiveInteger .
+   samm:characteristic samm-c:Text ;
+   samm:exampleValue "01" .
 
 :CharacteristicCustomerPartID a samm:Characteristic ;
    samm:preferredName "customerPartID_characteristic"@en ;
@@ -56,9 +56,6 @@
    samm:description "List of result objects"@en ;
    samm:dataType :MeasurmentObject .
 
-:CharacteristicRevisionIndex a samm:Characteristic ;
-   samm:dataType xsd:positiveInteger .
-
 :MeasurmentObject a samm:Entity ;
    samm:preferredName "Measurmentobject"@en ;
    samm:description "This Entity represents a generic Measurment Object"@en ;