diff --git a/abstract-specification/sections/06-other-clauses.adoc b/abstract-specification/sections/06-other-clauses.adoc
index 012dca3e..9208b8a5 100644
--- a/abstract-specification/sections/06-other-clauses.adoc
+++ b/abstract-specification/sections/06-other-clauses.adoc
@@ -18,7 +18,6 @@ class ReferenceSystem {
     }
 class SpatialReferenceSystem {
         <<abstract>>
-        dimension = 1..*
     }
 class TemporalReferenceSystem {
         <<abstract>>