diff --git a/XmlSchemaClassGenerator.Tests/XmlTests.cs b/XmlSchemaClassGenerator.Tests/XmlTests.cs
index 0c377936..4a79cda9 100644
--- a/XmlSchemaClassGenerator.Tests/XmlTests.cs
+++ b/XmlSchemaClassGenerator.Tests/XmlTests.cs
@@ -482,7 +482,7 @@ public void TestWfs()
                 {
                     OutputWriter = output,
                     EmitOrder = true,
-                    GenerateInterfaces = false
+                    GenerateInterfaces = true
                 });
             TestSamples("wfs", WfsPattern);
         }
@@ -992,7 +992,7 @@ public void EditorBrowsableAttributeRespectsCodeTypeReferenceOptions(CodeTypeRef
             {
                 CodeTypeReferenceOptions = codeTypeReferenceOptions,
                 GenerateNullables = true,
-                GenerateInterfaces = false,
+                GenerateInterfaces = true,
                 NamespaceProvider = new NamespaceProvider
                 {
                     GenerateNamespace = key => "Test"
diff --git a/XmlSchemaClassGenerator/CodeUtilities.cs b/XmlSchemaClassGenerator/CodeUtilities.cs
index 6ce961b4..8abc4673 100644
--- a/XmlSchemaClassGenerator/CodeUtilities.cs
+++ b/XmlSchemaClassGenerator/CodeUtilities.cs
@@ -298,9 +298,14 @@ public static string GetUniquePropertyName(this TypeModel tm, string name)
                 var i = 0;
                 var n = name;
                 var baseClasses = cls.AllBaseClasses.ToList();
+                var props = cls.Properties.ToList();
 
-                while (baseClasses.SelectMany(b => b.Properties).Any(p => p.Name == n))
+                while (baseClasses.SelectMany(b => b.Properties)
+                    .Concat(props)
+                    .Any(p => p.Name == n))
+                {
                     n = name + (++i);
+                }
 
                 return n;
             }
diff --git a/XmlSchemaClassGenerator/ModelBuilder.cs b/XmlSchemaClassGenerator/ModelBuilder.cs
index 51dea5db..a2c97c8d 100644
--- a/XmlSchemaClassGenerator/ModelBuilder.cs
+++ b/XmlSchemaClassGenerator/ModelBuilder.cs
@@ -69,6 +69,7 @@ public ModelBuilder(GeneratorConfiguration configuration, XmlSchemaSet set)
 
             if (configuration.GenerateInterfaces)
             {
+                PromoteInterfacePropertiesToCollection();
                 RenameInterfacePropertiesIfRenamedInDerivedClasses();
                 RemoveDuplicateInterfaceProperties();
             }
@@ -184,7 +185,8 @@ private void RenameInterfacePropertiesIfRenamedInDerivedClasses()
                         {
                             if (implementationClassProperty.Name != implementationClassProperty.OriginalPropertyName
                                 && implementationClassProperty.OriginalPropertyName == interfaceProperty.Name
-                                && implementationClassProperty.XmlSchemaName == interfaceProperty.XmlSchemaName)
+                                && implementationClassProperty.XmlSchemaName == interfaceProperty.XmlSchemaName
+                                && implementationClassProperty.IsAttribute == interfaceProperty.IsAttribute)
                             {
                                 RenameInterfacePropertyInBaseClasses(interfaceModel, implementationClass, interfaceProperty, implementationClassProperty.Name);
                                 interfaceProperty.Name = implementationClassProperty.Name;
@@ -195,6 +197,28 @@ private void RenameInterfacePropertiesIfRenamedInDerivedClasses()
             }
         }
 
+        private void PromoteInterfacePropertiesToCollection()
+        {
+            foreach (var interfaceModel in Types.Values.OfType<InterfaceModel>())
+            {
+                foreach (var interfaceProperty in interfaceModel.Properties)
+                {
+                    var derivedProperties = interfaceModel.AllDerivedReferenceTypes().SelectMany(t => t.Properties)
+                        .Where(p => p.Name == interfaceProperty.Name || p.OriginalPropertyName == interfaceProperty.Name).ToList();
+
+                    if (derivedProperties.Any(p => p.IsCollection))
+                    {
+                        foreach (var derivedProperty in derivedProperties.Where(p => !p.IsCollection))
+                        {
+                            derivedProperty.IsCollection = true;
+                        }
+
+                        interfaceProperty.IsCollection = true;
+                    }
+                }
+            }
+        }
+
         private static void RenameInterfacePropertyInBaseClasses(InterfaceModel interfaceModel, ReferenceTypeModel implementationClass,
             PropertyModel interfaceProperty, string newName)
         {
@@ -752,6 +776,7 @@ private IEnumerable<PropertyModel> CreatePropertiesForAttributes(Uri source, Typ
                     {
                         var attributeQualifiedName = attribute.AttributeSchemaType.QualifiedName;
                         var attributeName = _configuration.NamingProvider.AttributeNameFromQualifiedName(attribute.QualifiedName, attribute);
+                        var originalAttributeName = attributeName;
 
                         if (attribute.Parent is XmlSchemaAttributeGroup attributeGroup
                             && attributeGroup.QualifiedName != typeModel.XmlSchemaName
@@ -795,6 +820,7 @@ private IEnumerable<PropertyModel> CreatePropertiesForAttributes(Uri source, Typ
                         {
                             OwningType = typeModel,
                             Name = attributeName,
+                            OriginalPropertyName = originalAttributeName,
                             XmlSchemaName = attribute.QualifiedName,
                             Type = CreateTypeModel(attribute.AttributeSchemaType, attributeQualifiedName),
                             IsAttribute = true,