From c33a3858b32877478566a3a2b792ff37ad220af9 Mon Sep 17 00:00:00 2001
From: Michael Ganss <michael@ganss.org>
Date: Fri, 12 Apr 2024 16:17:59 +0200
Subject: [PATCH] Reverse IsRequired interface and class alignment (see #501)

---
 XmlSchemaClassGenerator/ModelBuilder.cs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/XmlSchemaClassGenerator/ModelBuilder.cs b/XmlSchemaClassGenerator/ModelBuilder.cs
index a72c9dd..5099e38 100644
--- a/XmlSchemaClassGenerator/ModelBuilder.cs
+++ b/XmlSchemaClassGenerator/ModelBuilder.cs
@@ -237,16 +237,16 @@ private void PromoteInterfacePropertiesToCollection()
                         interfaceProperty.IsCollection = false;
                     }
 
-                    if (derivedProperties.Exists(p => p.IsRequired))
+                    if (derivedProperties.Exists(p => !p.IsRequired))
                     {
                         foreach (var derivedProperty in derivedProperties.Where(p => !p.IsRequired))
-                            derivedProperty.IsRequired = true;
+                            derivedProperty.IsRequired = false;
 
-                        interfaceProperty.IsRequired = true;
+                        interfaceProperty.IsRequired = false;
                     }
                     else
                     {
-                        interfaceProperty.IsRequired = false;
+                        interfaceProperty.IsRequired = true;
                     }
                 }
             }