@@ -13,12 +13,12 @@ namespace Microsoft.OpenApi
     public class CompositeExpression : RuntimeExpression
     {
         private readonly string template;
-        private Regex expressionPattern = new(@"{(?<exp>\$[^}]*)");
+        private readonly Regex expressionPattern = new(@"{(?<exp>\$[^}]*)");
 
         /// <summary>
         /// Expressions embedded into string literal
         /// </summary>
-        public List<RuntimeExpression> ContainedExpressions = new();
+        public List<RuntimeExpression> ContainedExpressions { get; } = new();
 
         /// <summary>
         /// Create a composite expression from a string literal with an embedded expression
 
@@ -53,8 +53,8 @@ namespace Microsoft.OpenApi
     }
     public class CompositeExpression : Microsoft.OpenApi.RuntimeExpression
     {
-        public System.Collections.Generic.List<Microsoft.OpenApi.RuntimeExpression> ContainedExpressions;
         public CompositeExpression(string expression) { }
+        public System.Collections.Generic.List<Microsoft.OpenApi.RuntimeExpression> ContainedExpressions { get; }
         public override string Expression { get; }
     }
     public class CurrentKeys
Original file line number	Diff line number	Diff line change
`@@ -53,8 +53,8 @@ namespace Microsoft.OpenApi`
`53`	`53`	`}`
`54`	`54`	`public class CompositeExpression : Microsoft.OpenApi.RuntimeExpression`
`55`	`55`	`{`
`56`		`- public System.Collections.Generic.List<Microsoft.OpenApi.RuntimeExpression> ContainedExpressions;`
`57`	`56`	`public CompositeExpression(string expression) { }`
	`57`	`+ public System.Collections.Generic.List<Microsoft.OpenApi.RuntimeExpression> ContainedExpressions { get; }`
`58`	`58`	`public override string Expression { get; }`
`59`	`59`	`}`
`60`	`60`	`public class CurrentKeys`