diff --git a/include/xo/expression2/SetupExpression2.hpp b/include/xo/expression2/SetupExpression2.hpp
new file mode 100644
index 00000000..819bdff6
--- /dev/null
+++ b/include/xo/expression2/SetupExpression2.hpp
@@ -0,0 +1,25 @@
+/** @file SetupExpression2.hpp
+ *
+ *  @author Roland Conybeare, Jan 2026
+ **/
+
+#pragma once
+
+#include <xo/alloc2/Collector.hpp>
+
+namespace xo {
+    namespace scm {
+        class SetupExpression2 {
+        public:
+            using ACollector = xo::mm::ACollector;
+
+        public:
+            /** Register expression2 (facet,impl) combinations with FacetRegistry **/
+            static bool register_facets();
+            /** Register expression2 (facet,impl) combinations with FacetRegistry **/
+            static bool register_types(obj<ACollector> gc);
+        };
+    }
+}
+
+/* end SetupExpression2.hpp */
diff --git a/include/xo/expression2/expression2_register_facets.hpp b/include/xo/expression2/expression2_register_facets.hpp
deleted file mode 100644
index 1a559c72..00000000
--- a/include/xo/expression2/expression2_register_facets.hpp
+++ /dev/null
@@ -1,17 +0,0 @@
-/** @file expression2_register_facets.hpp
- *
- *  @author Roland Conybeare, Jan 2026
- **/
-
-#pragma once
-
-#include <xo/alloc2/Collector.hpp>
-
-namespace xo {
-    namespace scm {
-        /** Register expression2 (facet,impl) combinations with FacetRegistry **/
-        bool expression2_register_facets();
-    }
-}
-
-/* end expression2_register_facets.hpp */
diff --git a/include/xo/expression2/expression2_register_types.hpp b/include/xo/expression2/expression2_register_types.hpp
index 58105eed..c19c3863 100644
--- a/include/xo/expression2/expression2_register_types.hpp
+++ b/include/xo/expression2/expression2_register_types.hpp
@@ -9,8 +9,6 @@
 
 namespace xo {
     namespace scm {
-        /** Register expression2 (facet,impl) combinations with FacetRegistry **/
-        bool expression2_register_types(obj<xo::mm::ACollector> gc);
     }
 }
 
diff --git a/src/expression2/CMakeLists.txt b/src/expression2/CMakeLists.txt
index 42b491fc..574b9526 100644
--- a/src/expression2/CMakeLists.txt
+++ b/src/expression2/CMakeLists.txt
@@ -3,8 +3,7 @@
 set(SELF_LIB xo_expression2)
 set(SELF_SRCS
     init_expression2.cpp
-    expression2_register_facets.cpp
-    expression2_register_types.cpp
+    SetupExpression2.cpp
 
     DConstant.cpp
     DVariable.cpp
diff --git a/src/expression2/expression2_register_facets.cpp b/src/expression2/SetupExpression2.cpp
similarity index 80%
rename from src/expression2/expression2_register_facets.cpp
rename to src/expression2/SetupExpression2.cpp
index 1e68c771..5e86e795 100644
--- a/src/expression2/expression2_register_facets.cpp
+++ b/src/expression2/SetupExpression2.cpp
@@ -1,13 +1,9 @@
-/** @file expression2_register_facets.cpp
+/** @file SetupExpression2.cpp
  *
  *  @author Roland Conybeare, Jan 2026
  **/
 
-#include "expression2_register_facets.hpp"
-
-//#include <xo/expression2/detail/IExpression_DVariable.hpp>
-//#include <xo/expression2/detail/IGCObject_DVariable.hpp>
-//#include <xo/expression2/detail/IPrintable_DVariable.hpp>
+#include "SetupExpression2.hpp"
 
 #include <xo/expression2/DefineExpr.hpp>
 #include <xo/expression2/Variable.hpp>
@@ -17,8 +13,8 @@
 #include <xo/expression2/ApplyExpr.hpp>
 #include <xo/expression2/LambdaExpr.hpp>
 #include <xo/expression2/IfElseExpr.hpp>
+#include <xo/expression2/SequenceExpr.hpp>
 
-#include <xo/expression2/detail/IExpression_DSequenceExpr.hpp>
 #include <xo/expression2/detail/IGCObject_DSequenceExpr.hpp>
 #include <xo/expression2/detail/IPrintable_DSequenceExpr.hpp>
 
@@ -36,10 +32,11 @@ namespace xo {
     using xo::facet::FacetRegistry;
     using xo::facet::TypeRegistry;
     using xo::facet::typeseq;
+    using xo::facet::impl_for;
 
     namespace scm {
         bool
-        expression2_register_facets()
+        SetupExpression2::register_facets()
         {
             scope log(XO_DEBUG(true));
 
@@ -126,7 +123,28 @@ namespace xo {
 
             return true;
         }
-    } /*namespace scm*/
+
+        bool
+        SetupExpression2::register_types(obj<ACollector> gc)
+        {
+            scope log(XO_DEBUG(true));
+
+            bool ok = true;
+
+            ok &= gc.install_type(impl_for<AGCObject, DConstant>());
+            ok &= gc.install_type(impl_for<AGCObject, DVariable>());
+            ok &= gc.install_type(impl_for<AGCObject, DTypename>());
+            ok &= gc.install_type(impl_for<AGCObject, DDefineExpr>());
+            //ok &= gc.install_type(impl_for<AGCObject, DApplyExpr>());   // when avail
+            ok &= gc.install_type(impl_for<AGCObject, DLambdaExpr>());
+            ok &= gc.install_type(impl_for<AGCObject, DIfElseExpr>());
+            ok &= gc.install_type(impl_for<AGCObject, DSequenceExpr>());
+
+            ok &= gc.install_type(impl_for<AGCObject, DLocalSymtab>());
+            ok &= gc.install_type(impl_for<AGCObject, DGlobalSymtab>());
+
+            return ok;
+        }    } /*namespace scm*/
 } /*namespace xo*/
 
-/* end expression2_register_facets.cpp */
+/* end SetupExpression2.cpp */
diff --git a/src/expression2/expression2_register_types.cpp b/src/expression2/expression2_register_types.cpp
deleted file mode 100644
index c62ea264..00000000
--- a/src/expression2/expression2_register_types.cpp
+++ /dev/null
@@ -1,57 +0,0 @@
-/** @file expression2_register_types.cpp
- *
- *  @author Roland Conybeare, Jan 2026
- **/
-
-#include "expression2_register_types.hpp"
-
-#include "DefineExpr.hpp"
-#include "Constant.hpp"
-#include "Variable.hpp"
-#include "Typename.hpp"
-//#include "detail/IGCObject_DDefineExpr.hpp"   // when avail
-//#include "detail/IGCObject_DApplyExpr.hpp"    // when avail
-#include "LambdaExpr.hpp"
-#include "IfElseExpr.hpp"
-#include "SequenceExpr.hpp"
-#include "LocalSymtab.hpp"
-#include "GlobalSymtab.hpp"
-//#include "detail/IGCObject_DLocalSymtab.hpp"  // when avail
-//#include "detail/IGCObject_DUniqueString.hpp"
-
-//#include "detail/IPrintable_DUniqueString.hpp" // when avail
-
-#include <xo/indentlog/scope.hpp>
-
-namespace xo {
-    using xo::mm::ACollector;
-    using xo::mm::AGCObject;
-    using xo::facet::impl_for;
-    using xo::scope;
-
-    namespace scm {
-        bool
-        expression2_register_types(obj<ACollector> gc)
-        {
-            scope log(XO_DEBUG(true));
-
-            bool ok = true;
-
-            ok &= gc.install_type(impl_for<AGCObject, DConstant>());
-            ok &= gc.install_type(impl_for<AGCObject, DVariable>());
-            ok &= gc.install_type(impl_for<AGCObject, DTypename>());
-            ok &= gc.install_type(impl_for<AGCObject, DDefineExpr>());
-            //ok &= gc.install_type(impl_for<AGCObject, DApplyExpr>());   // when avail
-            ok &= gc.install_type(impl_for<AGCObject, DLambdaExpr>());
-            ok &= gc.install_type(impl_for<AGCObject, DIfElseExpr>());
-            ok &= gc.install_type(impl_for<AGCObject, DSequenceExpr>());
-
-            ok &= gc.install_type(impl_for<AGCObject, DLocalSymtab>());
-            ok &= gc.install_type(impl_for<AGCObject, DGlobalSymtab>());
-
-            return ok;
-        }
-    }
-} /*namespace xo*/
-
-/* end expression2_register_types.cpp */
diff --git a/src/expression2/init_expression2.cpp b/src/expression2/init_expression2.cpp
index 0d107316..a80d6625 100644
--- a/src/expression2/init_expression2.cpp
+++ b/src/expression2/init_expression2.cpp
@@ -4,23 +4,22 @@
  **/
 
 #include "init_expression2.hpp"
-#include "expression2_register_facets.hpp"
+#include "SetupExpression2.hpp"
 #include "expression2_register_types.hpp"
 
 #include <xo/procedure2/init_procedure2.hpp>
 #include <xo/alloc2/CollectorTypeRegistry.hpp>
 
 namespace xo {
-    using xo::scm::expression2_register_facets;
-    using xo::scm::expression2_register_types;
+    using xo::scm::SetupExpression2;
     using xo::mm::CollectorTypeRegistry;
 
     void
     InitSubsys<S_expression2_tag>::init()
         {
-            expression2_register_facets();
+            SetupExpression2::register_facets();
 
-            CollectorTypeRegistry::instance().register_types(&expression2_register_types);
+            CollectorTypeRegistry::instance().register_types(&SetupExpression2::register_types);
         }
 
     InitEvidence