diff --git a/src/types/get_folder.rs b/src/types/get_folder.rs
index 990d654..b739b93 100644
--- a/src/types/get_folder.rs
+++ b/src/types/get_folder.rs
@@ -6,7 +6,8 @@ use serde::Deserialize;
 use xml_struct::XmlSerialize;
 
 use crate::{
-    BaseFolderId, Folder, FolderShape, Operation, OperationResponse, ResponseClass, MESSAGES_NS_URI,
+    types::sealed::NamedStructure, BaseFolderId, Folder, FolderShape, Operation, OperationResponse,
+    ResponseClass, MESSAGES_NS_URI,
 };
 
 /// A request to get information on one or more folders.
@@ -21,7 +22,9 @@ pub struct GetFolder {
 
 impl Operation for GetFolder {
     type Response = GetFolderResponse;
+}
 
+impl NamedStructure for GetFolder {
     fn name() -> &'static str {
         "GetFolder"
     }
@@ -36,7 +39,9 @@ pub struct GetFolderResponse {
     pub response_messages: ResponseMessages,
 }
 
-impl OperationResponse for GetFolderResponse {
+impl OperationResponse for GetFolderResponse {}
+
+impl NamedStructure for GetFolderResponse {
     fn name() -> &'static str {
         "GetFolderResponse"
     }
diff --git a/src/types/operations.rs b/src/types/operations.rs
index d538902..b967f58 100644
--- a/src/types/operations.rs
+++ b/src/types/operations.rs
@@ -5,12 +5,14 @@
 use serde::Deserialize;
 use xml_struct::XmlSerialize;
 
-pub trait Operation: XmlSerialize {
+pub trait Operation: XmlSerialize + sealed::NamedStructure {
     type Response: OperationResponse;
-
-    fn name() -> &'static str;
 }
 
-pub trait OperationResponse: for<'de> Deserialize<'de> {
-    fn name() -> &'static str;
+pub trait OperationResponse: for<'de> Deserialize<'de> + sealed::NamedStructure {}
+
+pub(super) mod sealed {
+    pub trait NamedStructure {
+        fn name() -> &'static str;
+    }
 }
diff --git a/src/types/soap.rs b/src/types/soap.rs
index a8c17b2..362a5f5 100644
--- a/src/types/soap.rs
+++ b/src/types/soap.rs
@@ -453,7 +453,7 @@ pub struct FaultDetail {
 mod tests {
     use serde::Deserialize;
 
-    use crate::{Error, OperationResponse};
+    use crate::{types::sealed::NamedStructure, Error, OperationResponse};
 
     use super::Envelope;
 
@@ -467,7 +467,9 @@ mod tests {
             _other_field: (),
         }
 
-        impl OperationResponse for SomeStruct {
+        impl OperationResponse for SomeStruct {}
+
+        impl NamedStructure for SomeStruct {
             fn name() -> &'static str {
                 "Foo"
             }
@@ -492,7 +494,9 @@ mod tests {
         #[derive(Debug, Deserialize)]
         struct Foo;
 
-        impl OperationResponse for Foo {
+        impl OperationResponse for Foo {}
+
+        impl NamedStructure for Foo {
             fn name() -> &'static str {
                 "Foo"
             }
@@ -543,7 +547,9 @@ mod tests {
         #[derive(Debug, Deserialize)]
         struct Foo;
 
-        impl OperationResponse for Foo {
+        impl OperationResponse for Foo {}
+
+        impl NamedStructure for Foo {
             fn name() -> &'static str {
                 "Foo"
             }
diff --git a/src/types/sync_folder_hierarchy.rs b/src/types/sync_folder_hierarchy.rs
index 722e8d2..39ec3b0 100644
--- a/src/types/sync_folder_hierarchy.rs
+++ b/src/types/sync_folder_hierarchy.rs
@@ -6,8 +6,8 @@ use serde::Deserialize;
 use xml_struct::XmlSerialize;
 
 use crate::{
-    BaseFolderId, Folder, FolderId, FolderShape, Operation, OperationResponse, ResponseClass,
-    MESSAGES_NS_URI,
+    types::sealed::NamedStructure, BaseFolderId, Folder, FolderId, FolderShape, Operation,
+    OperationResponse, ResponseClass, MESSAGES_NS_URI,
 };
 
 /// The request for update regarding the folder hierarchy in a mailbox.
@@ -23,7 +23,9 @@ pub struct SyncFolderHierarchy {
 
 impl Operation for SyncFolderHierarchy {
     type Response = SyncFolderHierarchyResponse;
+}
 
+impl NamedStructure for SyncFolderHierarchy {
     fn name() -> &'static str {
         "SyncFolderHierarchy"
     }
@@ -38,7 +40,9 @@ pub struct SyncFolderHierarchyResponse {
     pub response_messages: ResponseMessages,
 }
 
-impl OperationResponse for SyncFolderHierarchyResponse {
+impl OperationResponse for SyncFolderHierarchyResponse {}
+
+impl NamedStructure for SyncFolderHierarchyResponse {
     fn name() -> &'static str {
         "SyncFolderHierarchyResponse"
     }