diff --git a/xo-expression2/CMakeLists.txt b/xo-expression2/CMakeLists.txt
index 4f7705ce..7cc83f11 100644
--- a/xo-expression2/CMakeLists.txt
+++ b/xo-expression2/CMakeLists.txt
@@ -250,6 +250,30 @@ xo_add_genfacetimpl(
     OUTPUT_CPP_DIR src/expression2
 )
 
+# note: manual target; generated code committed to git
+xo_add_genfacetimpl(
+    TARGET xo-expression2-facetimpl-gcobject-sequenceexpr
+    FACET_PKG xo_gc
+    FACET GCObject
+    REPR SequenceExpr
+    INPUT idl/IGCObject_DSequenceExpr.json5
+    OUTPUT_HPP_DIR include/xo/expression2
+    OUTPUT_IMPL_SUBDIR detail
+    OUTPUT_CPP_DIR src/expression2
+)
+
+# note: manual target; generated code committed to git
+xo_add_genfacetimpl(
+    TARGET xo-expression2-facetimpl-printable-sequenceexpr
+    FACET_PKG xo_printable2
+    FACET Printable
+    REPR SequenceExpr
+    INPUT idl/IPrintable_DSequenceExpr.json5
+    OUTPUT_HPP_DIR include/xo/expression2
+    OUTPUT_IMPL_SUBDIR detail
+    OUTPUT_CPP_DIR src/expression2
+)
+
 # ----------------------------------------------------------------
 
 # note: manual target; generated code committed to git
diff --git a/xo-expression2/idl/IGCObject_DSequenceExpr.json5 b/xo-expression2/idl/IGCObject_DSequenceExpr.json5
new file mode 100644
index 00000000..d3bf4aef
--- /dev/null
+++ b/xo-expression2/idl/IGCObject_DSequenceExpr.json5
@@ -0,0 +1,15 @@
+{
+    mode: "implementation",
+    includes: [
+        "<xo/gc/GCObject.hpp>",
+        "<xo/alloc2/Allocator.hpp>"
+    ],
+    local_types: [ ],
+    namespace1: "xo",
+    namespace2: "scm",
+    facet_idl: "idl/GCObject.json5",
+    brief: "provide AGCObject interface for DSequenceExpr",
+    using_doxygen: true,
+    repr: "DSequenceExpr",
+    doc: [ "implement AGCObject for DSequenceExpr" ],
+}
diff --git a/xo-expression2/idl/IPrintable_DSequenceExpr.json5 b/xo-expression2/idl/IPrintable_DSequenceExpr.json5
new file mode 100644
index 00000000..34154a1e
--- /dev/null
+++ b/xo-expression2/idl/IPrintable_DSequenceExpr.json5
@@ -0,0 +1,13 @@
+{
+    mode: "implementation",
+    includes: [ "<xo/printable2/Printable.hpp>",
+                "<xo/printable2/detail/IPrintable_Xfer.hpp>" ],
+    local_types: [ ],
+    namespace1: "xo",
+    namespace2: "scm",
+    facet_idl: "idl/Printable.json5",
+    brief: "provide APrintable interface for DSequenceExpr",
+    using_doxygen: true,
+    repr: "DSequenceExpr",
+    doc: [ "implement APrintable for DSequenceExpr" ],
+}
diff --git a/xo-expression2/include/xo/expression2/DSequenceExpr.hpp b/xo-expression2/include/xo/expression2/DSequenceExpr.hpp
index 7285ada8..c5bb6f16 100644
--- a/xo-expression2/include/xo/expression2/DSequenceExpr.hpp
+++ b/xo-expression2/include/xo/expression2/DSequenceExpr.hpp
@@ -22,6 +22,7 @@ namespace xo {
          **/
         class DSequenceExpr {
         public:
+            using ACollector = xo::mm::ACollector;
             using AAllocator = xo::mm::AAllocator;
             using TypeDescr = xo::reflect::TypeDescr;
             using size_type = DArray::size_type;
@@ -68,6 +69,14 @@ namespace xo {
             bool pretty(const ppindentinfo & ppii) const;
 
             ///@}
+            /** @defgroup scm-sequenceexpr-gcobject-facet gcobject facet methods **/
+            ///@{
+
+            std::size_t shallow_size() const noexcept;
+            DSequenceExpr * shallow_copy(obj<AAllocator> mm) const noexcept;
+            std::size_t forward_children(obj<ACollector> gc) noexcept;
+
+            ///@}
 
         private:
             /** expression value always has type consistent with this description
diff --git a/xo-expression2/include/xo/expression2/Expression.hpp b/xo-expression2/include/xo/expression2/Expression.hpp
index 60e8a402..df4161a1 100644
--- a/xo-expression2/include/xo/expression2/Expression.hpp
+++ b/xo-expression2/include/xo/expression2/Expression.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/Expression.json5]
  *  2. jinja2 template for facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/SymbolTable.hpp b/xo-expression2/include/xo/expression2/SymbolTable.hpp
index 09fc04a8..26576ed6 100644
--- a/xo-expression2/include/xo/expression2/SymbolTable.hpp
+++ b/xo-expression2/include/xo/expression2/SymbolTable.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/SymbolTable.json5]
  *  2. jinja2 template for facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/AExpression.hpp b/xo-expression2/include/xo/expression2/detail/AExpression.hpp
index 10375114..e080ece8 100644
--- a/xo-expression2/include/xo/expression2/detail/AExpression.hpp
+++ b/xo-expression2/include/xo/expression2/detail/AExpression.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/Expression.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IExpression_Any.hpp b/xo-expression2/include/xo/expression2/detail/IExpression_Any.hpp
index c92c2c4a..17545afb 100644
--- a/xo-expression2/include/xo/expression2/detail/IExpression_Any.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IExpression_Any.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/Expression.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IExpression_DApplyExpr.hpp b/xo-expression2/include/xo/expression2/detail/IExpression_DApplyExpr.hpp
index d577854f..c8952199 100644
--- a/xo-expression2/include/xo/expression2/detail/IExpression_DApplyExpr.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IExpression_DApplyExpr.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DApplyExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IExpression_DConstant.hpp b/xo-expression2/include/xo/expression2/detail/IExpression_DConstant.hpp
index 89c5044c..61b92e12 100644
--- a/xo-expression2/include/xo/expression2/detail/IExpression_DConstant.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IExpression_DConstant.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DConstant.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IExpression_DDefineExpr.hpp b/xo-expression2/include/xo/expression2/detail/IExpression_DDefineExpr.hpp
index f5585b60..3ac7fd49 100644
--- a/xo-expression2/include/xo/expression2/detail/IExpression_DDefineExpr.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IExpression_DDefineExpr.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DDefineExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IExpression_DIfElseExpr.hpp b/xo-expression2/include/xo/expression2/detail/IExpression_DIfElseExpr.hpp
index 03500a39..7d726dde 100644
--- a/xo-expression2/include/xo/expression2/detail/IExpression_DIfElseExpr.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IExpression_DIfElseExpr.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DIfElseExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IExpression_DLambdaExpr.hpp b/xo-expression2/include/xo/expression2/detail/IExpression_DLambdaExpr.hpp
index 916b82ac..d488b6b3 100644
--- a/xo-expression2/include/xo/expression2/detail/IExpression_DLambdaExpr.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IExpression_DLambdaExpr.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DLambdaExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IExpression_DSequenceExpr.hpp b/xo-expression2/include/xo/expression2/detail/IExpression_DSequenceExpr.hpp
index b010ac65..e66d657c 100644
--- a/xo-expression2/include/xo/expression2/detail/IExpression_DSequenceExpr.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IExpression_DSequenceExpr.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DSequenceExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IExpression_DVariable.hpp b/xo-expression2/include/xo/expression2/detail/IExpression_DVariable.hpp
index 95b1becb..6b9b702f 100644
--- a/xo-expression2/include/xo/expression2/detail/IExpression_DVariable.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IExpression_DVariable.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DVariable.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IExpression_Xfer.hpp b/xo-expression2/include/xo/expression2/detail/IExpression_Xfer.hpp
index 9f7356bc..fac8c541 100644
--- a/xo-expression2/include/xo/expression2/detail/IExpression_Xfer.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IExpression_Xfer.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/Expression.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IGCObject_DSequenceExpr.hpp b/xo-expression2/include/xo/expression2/detail/IGCObject_DSequenceExpr.hpp
new file mode 100644
index 00000000..5ffb5007
--- /dev/null
+++ b/xo-expression2/include/xo/expression2/detail/IGCObject_DSequenceExpr.hpp
@@ -0,0 +1,67 @@
+/** @file IGCObject_DSequenceExpr.hpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IGCObject_DSequenceExpr.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_repr.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IGCObject_DSequenceExpr.json5]
+ **/
+
+#pragma once
+
+#include "GCObject.hpp"
+#include <xo/gc/GCObject.hpp>
+#include <xo/alloc2/Allocator.hpp>
+#include "DSequenceExpr.hpp"
+
+namespace xo { namespace scm { class IGCObject_DSequenceExpr; } }
+
+namespace xo {
+    namespace facet {
+        template <>
+        struct FacetImplementation<xo::mm::AGCObject,
+                                   xo::scm::DSequenceExpr>
+        {
+            using ImplType = xo::mm::IGCObject_Xfer
+              <xo::scm::DSequenceExpr,
+               xo::scm::IGCObject_DSequenceExpr>;
+        };
+    }
+}
+
+namespace xo {
+    namespace scm {
+        /** @class IGCObject_DSequenceExpr
+         **/
+        class IGCObject_DSequenceExpr {
+        public:
+            /** @defgroup scm-gcobject-dsequenceexpr-type-traits **/
+            ///@{
+            using size_type = xo::mm::AGCObject::size_type;
+            using AAllocator = xo::mm::AGCObject::AAllocator;
+            using ACollector = xo::mm::AGCObject::ACollector;
+            using Copaque = xo::mm::AGCObject::Copaque;
+            using Opaque = xo::mm::AGCObject::Opaque;
+            ///@}
+            /** @defgroup scm-gcobject-dsequenceexpr-methods **/
+            ///@{
+            // const methods
+            /** memory consumption for this instance **/
+            static size_type shallow_size(const DSequenceExpr & self) noexcept;
+            /** copy instance using allocator **/
+            static Opaque shallow_copy(const DSequenceExpr & self, obj<AAllocator> mm) noexcept;
+
+            // non-const methods
+            /** during GC: forward immdiate children **/
+            static size_type forward_children(DSequenceExpr & self, obj<ACollector> gc) noexcept;
+            ///@}
+        };
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end */
\ No newline at end of file
diff --git a/xo-expression2/include/xo/expression2/detail/IGCObject_DUniqueString.hpp b/xo-expression2/include/xo/expression2/detail/IGCObject_DUniqueString.hpp
index c95db10f..b971daea 100644
--- a/xo-expression2/include/xo/expression2/detail/IGCObject_DUniqueString.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IGCObject_DUniqueString.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IGCObject_DUniqueString.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IGCObject_DVariable.hpp b/xo-expression2/include/xo/expression2/detail/IGCObject_DVariable.hpp
index aee612ea..24dc591f 100644
--- a/xo-expression2/include/xo/expression2/detail/IGCObject_DVariable.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IGCObject_DVariable.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IGCObject_DVariable.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IPrintable_DApplyExpr.hpp b/xo-expression2/include/xo/expression2/detail/IPrintable_DApplyExpr.hpp
index b7782166..c05e87e2 100644
--- a/xo-expression2/include/xo/expression2/detail/IPrintable_DApplyExpr.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IPrintable_DApplyExpr.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DApplyExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IPrintable_DConstant.hpp b/xo-expression2/include/xo/expression2/detail/IPrintable_DConstant.hpp
index 35535d80..a1e31382 100644
--- a/xo-expression2/include/xo/expression2/detail/IPrintable_DConstant.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IPrintable_DConstant.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DConstant.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IPrintable_DDefineExpr.hpp b/xo-expression2/include/xo/expression2/detail/IPrintable_DDefineExpr.hpp
index 758022a6..6d727d86 100644
--- a/xo-expression2/include/xo/expression2/detail/IPrintable_DDefineExpr.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IPrintable_DDefineExpr.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DDefineExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IPrintable_DIfElseExpr.hpp b/xo-expression2/include/xo/expression2/detail/IPrintable_DIfElseExpr.hpp
index e9cf67ff..fcf80fd5 100644
--- a/xo-expression2/include/xo/expression2/detail/IPrintable_DIfElseExpr.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IPrintable_DIfElseExpr.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DIfElseExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IPrintable_DLambdaExpr.hpp b/xo-expression2/include/xo/expression2/detail/IPrintable_DLambdaExpr.hpp
index 45970bd8..64ab6af1 100644
--- a/xo-expression2/include/xo/expression2/detail/IPrintable_DLambdaExpr.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IPrintable_DLambdaExpr.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DLambdaExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IPrintable_DSequenceExpr.hpp b/xo-expression2/include/xo/expression2/detail/IPrintable_DSequenceExpr.hpp
new file mode 100644
index 00000000..eec1649c
--- /dev/null
+++ b/xo-expression2/include/xo/expression2/detail/IPrintable_DSequenceExpr.hpp
@@ -0,0 +1,62 @@
+/** @file IPrintable_DSequenceExpr.hpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IPrintable_DSequenceExpr.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_repr.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IPrintable_DSequenceExpr.json5]
+ **/
+
+#pragma once
+
+#include "Printable.hpp"
+#include <xo/printable2/Printable.hpp>
+#include <xo/printable2/detail/IPrintable_Xfer.hpp>
+#include "DSequenceExpr.hpp"
+
+namespace xo { namespace scm { class IPrintable_DSequenceExpr; } }
+
+namespace xo {
+    namespace facet {
+        template <>
+        struct FacetImplementation<xo::print::APrintable,
+                                   xo::scm::DSequenceExpr>
+        {
+            using ImplType = xo::print::IPrintable_Xfer
+              <xo::scm::DSequenceExpr,
+               xo::scm::IPrintable_DSequenceExpr>;
+        };
+    }
+}
+
+namespace xo {
+    namespace scm {
+        /** @class IPrintable_DSequenceExpr
+         **/
+        class IPrintable_DSequenceExpr {
+        public:
+            /** @defgroup scm-printable-dsequenceexpr-type-traits **/
+            ///@{
+            using ppindentinfo = xo::print::APrintable::ppindentinfo;
+            using Copaque = xo::print::APrintable::Copaque;
+            using Opaque = xo::print::APrintable::Opaque;
+            ///@}
+            /** @defgroup scm-printable-dsequenceexpr-methods **/
+            ///@{
+            // const methods
+            /** Pretty-printing support for this object.
+See [xo-indentlog/xo/indentlog/pretty.hpp] **/
+            static bool pretty(const DSequenceExpr & self, const ppindentinfo & ppii);
+
+            // non-const methods
+            ///@}
+        };
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end */
\ No newline at end of file
diff --git a/xo-expression2/include/xo/expression2/detail/IPrintable_DUniqueString.hpp b/xo-expression2/include/xo/expression2/detail/IPrintable_DUniqueString.hpp
index 51afa9da..34c9da79 100644
--- a/xo-expression2/include/xo/expression2/detail/IPrintable_DUniqueString.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IPrintable_DUniqueString.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DUniqueString.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/IPrintable_DVariable.hpp b/xo-expression2/include/xo/expression2/detail/IPrintable_DVariable.hpp
index a31ee97e..6e97451b 100644
--- a/xo-expression2/include/xo/expression2/detail/IPrintable_DVariable.hpp
+++ b/xo-expression2/include/xo/expression2/detail/IPrintable_DVariable.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DVariable.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/detail/RExpression.hpp b/xo-expression2/include/xo/expression2/detail/RExpression.hpp
index caf69fe0..4d717640 100644
--- a/xo-expression2/include/xo/expression2/detail/RExpression.hpp
+++ b/xo-expression2/include/xo/expression2/detail/RExpression.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/Expression.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/symtab/ASymbolTable.hpp b/xo-expression2/include/xo/expression2/symtab/ASymbolTable.hpp
index 36d4c812..f0c6e10f 100644
--- a/xo-expression2/include/xo/expression2/symtab/ASymbolTable.hpp
+++ b/xo-expression2/include/xo/expression2/symtab/ASymbolTable.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/SymbolTable.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/symtab/IPrintable_DLocalSymtab.hpp b/xo-expression2/include/xo/expression2/symtab/IPrintable_DLocalSymtab.hpp
index d4481dca..c013e937 100644
--- a/xo-expression2/include/xo/expression2/symtab/IPrintable_DLocalSymtab.hpp
+++ b/xo-expression2/include/xo/expression2/symtab/IPrintable_DLocalSymtab.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DLocalSymtab.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/symtab/ISymbolTable_Any.hpp b/xo-expression2/include/xo/expression2/symtab/ISymbolTable_Any.hpp
index 6a119832..b642adb7 100644
--- a/xo-expression2/include/xo/expression2/symtab/ISymbolTable_Any.hpp
+++ b/xo-expression2/include/xo/expression2/symtab/ISymbolTable_Any.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/SymbolTable.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/symtab/ISymbolTable_DLocalSymtab.hpp b/xo-expression2/include/xo/expression2/symtab/ISymbolTable_DLocalSymtab.hpp
index 2c1816e4..72f409dd 100644
--- a/xo-expression2/include/xo/expression2/symtab/ISymbolTable_DLocalSymtab.hpp
+++ b/xo-expression2/include/xo/expression2/symtab/ISymbolTable_DLocalSymtab.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/ISymbolTable_DLocalSymtab.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/symtab/ISymbolTable_Xfer.hpp b/xo-expression2/include/xo/expression2/symtab/ISymbolTable_Xfer.hpp
index 2333bb05..3d5f7221 100644
--- a/xo-expression2/include/xo/expression2/symtab/ISymbolTable_Xfer.hpp
+++ b/xo-expression2/include/xo/expression2/symtab/ISymbolTable_Xfer.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/SymbolTable.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/include/xo/expression2/symtab/RSymbolTable.hpp b/xo-expression2/include/xo/expression2/symtab/RSymbolTable.hpp
index c72503cc..600ea4f8 100644
--- a/xo-expression2/include/xo/expression2/symtab/RSymbolTable.hpp
+++ b/xo-expression2/include/xo/expression2/symtab/RSymbolTable.hpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/SymbolTable.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/CMakeLists.txt b/xo-expression2/src/expression2/CMakeLists.txt
index ab10048e..4f929fa4 100644
--- a/xo-expression2/src/expression2/CMakeLists.txt
+++ b/xo-expression2/src/expression2/CMakeLists.txt
@@ -36,6 +36,8 @@ set(SELF_SRCS
     IPrintable_DIfElseExpr.cpp
 
     IExpression_DSequenceExpr.cpp
+    IGCObject_DSequenceExpr.cpp
+    IPrintable_DSequenceExpr.cpp
 
     DLocalSymtab.cpp
     DGlobalSymtab.cpp
diff --git a/xo-expression2/src/expression2/DSequenceExpr.cpp b/xo-expression2/src/expression2/DSequenceExpr.cpp
index 5e449531..73b9c2b5 100644
--- a/xo-expression2/src/expression2/DSequenceExpr.cpp
+++ b/xo-expression2/src/expression2/DSequenceExpr.cpp
@@ -5,6 +5,7 @@
 
 #include "DSequenceExpr.hpp"
 #include "detail/IExpression_DSequenceExpr.hpp"
+#include <xo/object2/array/IGCObject_DArray.hpp>
 #include <xo/gc/GCObject.hpp>
 #include <xo/alloc2/Allocator.hpp>
 #include <xo/printable2/Printable.hpp>
@@ -99,6 +100,39 @@ namespace xo {
                  "DSequenceExpr");
         }
 
+        // gc hooks for IGCObject_DSequenceExpr
+
+        std::size_t
+        DSequenceExpr::shallow_size() const noexcept
+        {
+            return sizeof(DSequenceExpr);
+        }
+
+        DSequenceExpr *
+        DSequenceExpr::shallow_copy(obj<AAllocator> mm) const noexcept
+        {
+            DSequenceExpr * copy = (DSequenceExpr *)mm.alloc_copy((std::byte *)this);
+
+            if (copy)
+                *copy = *this;
+
+            return copy;
+        }
+
+        std::size_t
+        DSequenceExpr::forward_children(obj<ACollector> gc) noexcept
+        {
+            // WARNING.
+            //   if this proves problematic,
+            //   may resort to obj<AGCObject,DArray> for expr_v_ member
+
+            auto iface = facet::impl_for<AGCObject,DArray>();
+
+            gc.forward_inplace(&iface, (void**)&expr_v_);
+
+            return shallow_size();
+        }
+
     } /*namespace scm*/
 } /*namespace xo*/
 
diff --git a/xo-expression2/src/expression2/IExpression_DApplyExpr.cpp b/xo-expression2/src/expression2/IExpression_DApplyExpr.cpp
index c00e91dc..2098e050 100644
--- a/xo-expression2/src/expression2/IExpression_DApplyExpr.cpp
+++ b/xo-expression2/src/expression2/IExpression_DApplyExpr.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DApplyExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IExpression_DConstant.cpp b/xo-expression2/src/expression2/IExpression_DConstant.cpp
index 0e91d27d..2d39c36d 100644
--- a/xo-expression2/src/expression2/IExpression_DConstant.cpp
+++ b/xo-expression2/src/expression2/IExpression_DConstant.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DConstant.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IExpression_DDefineExpr.cpp b/xo-expression2/src/expression2/IExpression_DDefineExpr.cpp
index ab0676a4..3222eabd 100644
--- a/xo-expression2/src/expression2/IExpression_DDefineExpr.cpp
+++ b/xo-expression2/src/expression2/IExpression_DDefineExpr.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DDefineExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IExpression_DIfElseExpr.cpp b/xo-expression2/src/expression2/IExpression_DIfElseExpr.cpp
index 78680310..d913eaf0 100644
--- a/xo-expression2/src/expression2/IExpression_DIfElseExpr.cpp
+++ b/xo-expression2/src/expression2/IExpression_DIfElseExpr.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DIfElseExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IExpression_DLambdaExpr.cpp b/xo-expression2/src/expression2/IExpression_DLambdaExpr.cpp
index d9174ad2..273f5544 100644
--- a/xo-expression2/src/expression2/IExpression_DLambdaExpr.cpp
+++ b/xo-expression2/src/expression2/IExpression_DLambdaExpr.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DLambdaExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IExpression_DSequenceExpr.cpp b/xo-expression2/src/expression2/IExpression_DSequenceExpr.cpp
index e269a114..cf00bc60 100644
--- a/xo-expression2/src/expression2/IExpression_DSequenceExpr.cpp
+++ b/xo-expression2/src/expression2/IExpression_DSequenceExpr.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DSequenceExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IExpression_DVariable.cpp b/xo-expression2/src/expression2/IExpression_DVariable.cpp
index ca657c36..2b4a007b 100644
--- a/xo-expression2/src/expression2/IExpression_DVariable.cpp
+++ b/xo-expression2/src/expression2/IExpression_DVariable.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IExpression_DVariable.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IGCObject_DSequenceExpr.cpp b/xo-expression2/src/expression2/IGCObject_DSequenceExpr.cpp
new file mode 100644
index 00000000..474851ed
--- /dev/null
+++ b/xo-expression2/src/expression2/IGCObject_DSequenceExpr.cpp
@@ -0,0 +1,39 @@
+/** @file IGCObject_DSequenceExpr.cpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IGCObject_DSequenceExpr.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_any.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IGCObject_DSequenceExpr.json5]
+**/
+
+#include "detail/IGCObject_DSequenceExpr.hpp"
+
+namespace xo {
+    namespace scm {
+        auto
+        IGCObject_DSequenceExpr::shallow_size(const DSequenceExpr & self) noexcept -> size_type
+        {
+            return self.shallow_size();
+        }
+
+        auto
+        IGCObject_DSequenceExpr::shallow_copy(const DSequenceExpr & self, obj<AAllocator> mm) noexcept -> Opaque
+        {
+            return self.shallow_copy(mm);
+        }
+
+        auto
+        IGCObject_DSequenceExpr::forward_children(DSequenceExpr & self, obj<ACollector> gc) noexcept -> size_type
+        {
+            return self.forward_children(gc);
+        }
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end IGCObject_DSequenceExpr.cpp */
\ No newline at end of file
diff --git a/xo-expression2/src/expression2/IGCObject_DUniqueString.cpp b/xo-expression2/src/expression2/IGCObject_DUniqueString.cpp
index 5d2553f0..b13b3f79 100644
--- a/xo-expression2/src/expression2/IGCObject_DUniqueString.cpp
+++ b/xo-expression2/src/expression2/IGCObject_DUniqueString.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IGCObject_DUniqueString.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IGCObject_DVariable.cpp b/xo-expression2/src/expression2/IGCObject_DVariable.cpp
index 8735b286..4af0f906 100644
--- a/xo-expression2/src/expression2/IGCObject_DVariable.cpp
+++ b/xo-expression2/src/expression2/IGCObject_DVariable.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IGCObject_DVariable.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IPrintable_DApplyExpr.cpp b/xo-expression2/src/expression2/IPrintable_DApplyExpr.cpp
index 6c7c16a8..4f4a50d3 100644
--- a/xo-expression2/src/expression2/IPrintable_DApplyExpr.cpp
+++ b/xo-expression2/src/expression2/IPrintable_DApplyExpr.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DApplyExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IPrintable_DConstant.cpp b/xo-expression2/src/expression2/IPrintable_DConstant.cpp
index 02e8bde0..1bacfb9d 100644
--- a/xo-expression2/src/expression2/IPrintable_DConstant.cpp
+++ b/xo-expression2/src/expression2/IPrintable_DConstant.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DConstant.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IPrintable_DDefineExpr.cpp b/xo-expression2/src/expression2/IPrintable_DDefineExpr.cpp
index 31f8c554..e8c6a799 100644
--- a/xo-expression2/src/expression2/IPrintable_DDefineExpr.cpp
+++ b/xo-expression2/src/expression2/IPrintable_DDefineExpr.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DDefineExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IPrintable_DIfElseExpr.cpp b/xo-expression2/src/expression2/IPrintable_DIfElseExpr.cpp
index ec68b9fc..a75cd6a4 100644
--- a/xo-expression2/src/expression2/IPrintable_DIfElseExpr.cpp
+++ b/xo-expression2/src/expression2/IPrintable_DIfElseExpr.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DIfElseExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IPrintable_DLambdaExpr.cpp b/xo-expression2/src/expression2/IPrintable_DLambdaExpr.cpp
index 966c9d2f..12e6c22c 100644
--- a/xo-expression2/src/expression2/IPrintable_DLambdaExpr.cpp
+++ b/xo-expression2/src/expression2/IPrintable_DLambdaExpr.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DLambdaExpr.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IPrintable_DLocalSymtab.cpp b/xo-expression2/src/expression2/IPrintable_DLocalSymtab.cpp
index 90f69407..dbd4887b 100644
--- a/xo-expression2/src/expression2/IPrintable_DLocalSymtab.cpp
+++ b/xo-expression2/src/expression2/IPrintable_DLocalSymtab.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DLocalSymtab.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IPrintable_DSequenceExpr.cpp b/xo-expression2/src/expression2/IPrintable_DSequenceExpr.cpp
new file mode 100644
index 00000000..d07c5f08
--- /dev/null
+++ b/xo-expression2/src/expression2/IPrintable_DSequenceExpr.cpp
@@ -0,0 +1,28 @@
+/** @file IPrintable_DSequenceExpr.cpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IPrintable_DSequenceExpr.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_any.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IPrintable_DSequenceExpr.json5]
+**/
+
+#include "detail/IPrintable_DSequenceExpr.hpp"
+
+namespace xo {
+    namespace scm {
+        auto
+        IPrintable_DSequenceExpr::pretty(const DSequenceExpr & self, const ppindentinfo & ppii) -> bool
+        {
+            return self.pretty(ppii);
+        }
+
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end IPrintable_DSequenceExpr.cpp */
\ No newline at end of file
diff --git a/xo-expression2/src/expression2/IPrintable_DUniqueString.cpp b/xo-expression2/src/expression2/IPrintable_DUniqueString.cpp
index ef7cf037..a7b92af8 100644
--- a/xo-expression2/src/expression2/IPrintable_DUniqueString.cpp
+++ b/xo-expression2/src/expression2/IPrintable_DUniqueString.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DUniqueString.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/IPrintable_DVariable.cpp b/xo-expression2/src/expression2/IPrintable_DVariable.cpp
index edf79638..75e673ae 100644
--- a/xo-expression2/src/expression2/IPrintable_DVariable.cpp
+++ b/xo-expression2/src/expression2/IPrintable_DVariable.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/IPrintable_DVariable.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/ISymbolTable_DLocalSymtab.cpp b/xo-expression2/src/expression2/ISymbolTable_DLocalSymtab.cpp
index 3e5e465c..778cfdf4 100644
--- a/xo-expression2/src/expression2/ISymbolTable_DLocalSymtab.cpp
+++ b/xo-expression2/src/expression2/ISymbolTable_DLocalSymtab.cpp
@@ -2,7 +2,7 @@
  *
  *  Generated automagically from ingredients:
  *  1. code generator:
- *       [/Users/roland/proj/xo-umbrella2/xo-facet/codegen/genfacet]
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
  *     arguments:
  *       --input [idl/ISymbolTable_DLocalSymtab.json5]
  *  2. jinja2 template for abstract facet .hpp file:
diff --git a/xo-expression2/src/expression2/expression2_register_facets.cpp b/xo-expression2/src/expression2/expression2_register_facets.cpp
index 06ccc7d5..8109293a 100644
--- a/xo-expression2/src/expression2/expression2_register_facets.cpp
+++ b/xo-expression2/src/expression2/expression2_register_facets.cpp
@@ -27,6 +27,10 @@
 #include <xo/expression2/detail/IExpression_DIfElseExpr.hpp>
 #include <xo/expression2/detail/IPrintable_DIfElseExpr.hpp>
 
+#include <xo/expression2/detail/IExpression_DSequenceExpr.hpp>
+#include <xo/expression2/detail/IGCObject_DSequenceExpr.hpp>
+#include <xo/expression2/detail/IPrintable_DSequenceExpr.hpp>
+
 #include <xo/expression2/symtab/ISymbolTable_DLocalSymtab.hpp>
 #include <xo/expression2/symtab/IPrintable_DLocalSymtab.hpp>
 
@@ -77,6 +81,10 @@ namespace xo {
             FacetRegistry::register_impl<AExpression, DIfElseExpr>();
             FacetRegistry::register_impl<APrintable, DIfElseExpr>();
 
+            FacetRegistry::register_impl<AExpression, DSequenceExpr>();
+            FacetRegistry::register_impl<AGCObject, DSequenceExpr>();
+            FacetRegistry::register_impl<APrintable, DSequenceExpr>();
+
             FacetRegistry::register_impl<ASymbolTable, DLocalSymtab>();
             FacetRegistry::register_impl<APrintable, DLocalSymtab>();
 
@@ -87,6 +95,7 @@ namespace xo {
             log && log(xtag("DApplyExpr.tseq", typeseq::id<DApplyExpr>()));
             log && log(xtag("DLambdaExpr.tseq", typeseq::id<DLambdaExpr>()));
             log && log(xtag("DIfElseExpr.tseq", typeseq::id<DIfElseExpr>()));
+            log && log(xtag("DSequenceExpr.tseq", typeseq::id<DSequenceExpr>()));
 
             log && log(xtag("DLocalSymtab.tseq", typeseq::id<DLocalSymtab>()));