clarify usage of abstract concepts

GfSE · Jun 3, 2024 · 07cc83f · 07cc83f
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diff --git a/developing-saf/metamodel-guideline/modelguideline.md b/developing-saf/metamodel-guideline/modelguideline.md
@@ -73,12 +73,14 @@ The Format Specification and the Protocol Definition are both issued by a Standa
 ### Abstract Concepts
 
 Note, that a concept can be marked as “Abstract”. This means that the abstract concept is not used directly but typically inherited concepts are used.
+Also see Generalization.
 
 Example:
 
 ![class](ex-concept-abstr.svg)
 
 `Rule: Use abstract metamodel items if appropriate.`
+`Rule: Do not expose abstract concepts.`
 
 ### Composition and Aggregation