Explain usage of term 'constraint expression'

opencypher · Jul 1, 2021 · 0cca4f6 · 0cca4f6
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diff --git a/cip/1.accepted/CIP2016-12-14-Constraint-syntax.adoc b/cip/1.accepted/CIP2016-12-14-Constraint-syntax.adoc
@@ -50,6 +50,9 @@ This allows for very complex concrete constraint definitions (using custom predi
 
 For details on `UNIQUE` and `NODE KEY`, see the dedicated sections below: <<uniqueness>>, <<node-key>>.
 
+The term 'constraint expression' is used in the following to describe the expressions that constitute the body of the constraint predicate.
+In other words, the `expression` or `property-expression` grammar references in the above syntax.
+
 ==== Constraint names
 
 All constraints provide the user the option to specify a nonempty _name_ at constraint creation time.