diff --git a/xo-object2/CMakeLists.txt b/xo-object2/CMakeLists.txt
index 529b7372..c7962ed7 100644
--- a/xo-object2/CMakeLists.txt
+++ b/xo-object2/CMakeLists.txt
@@ -148,6 +148,18 @@ xo_add_genfacetimpl(
     OUTPUT_CPP_DIR src/object2
 )
 
+# note: manual target; generated code committed to git
+xo_add_genfacetimpl(
+    TARGET xo-object2-facetimpl-gcobject-array
+    FACET_PKG xo_gc
+    FACET GCObject
+    REPR Array
+    INPUT idl/IGCObject_DArray.json5
+    OUTPUT_HPP_DIR include/xo/object2
+    OUTPUT_IMPL_SUBDIR array
+    OUTPUT_CPP_DIR src/object2
+)
+
 # ----------------------------------------------------------------
 
 # must complete definition of expression lib before configuring examples
diff --git a/xo-object2/idl/IGCObject_DArray.json5 b/xo-object2/idl/IGCObject_DArray.json5
new file mode 100644
index 00000000..e8aeed3b
--- /dev/null
+++ b/xo-object2/idl/IGCObject_DArray.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 DArray",
+    using_doxygen: true,
+    repr: "DArray",
+    doc: [ "implement AGCObject for DArray" ],
+}
diff --git a/xo-object2/include/xo/object2/array/IGCObject_DArray.hpp b/xo-object2/include/xo/object2/array/IGCObject_DArray.hpp
new file mode 100644
index 00000000..0b2279f1
--- /dev/null
+++ b/xo-object2/include/xo/object2/array/IGCObject_DArray.hpp
@@ -0,0 +1,67 @@
+/** @file IGCObject_DArray.hpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IGCObject_DArray.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_repr.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IGCObject_DArray.json5]
+ **/
+
+#pragma once
+
+#include "GCObject.hpp"
+#include <xo/gc/GCObject.hpp>
+#include <xo/alloc2/Allocator.hpp>
+#include "DArray.hpp"
+
+namespace xo { namespace scm { class IGCObject_DArray; } }
+
+namespace xo {
+    namespace facet {
+        template <>
+        struct FacetImplementation<xo::mm::AGCObject,
+                                   xo::scm::DArray>
+        {
+            using ImplType = xo::mm::IGCObject_Xfer
+              <xo::scm::DArray,
+               xo::scm::IGCObject_DArray>;
+        };
+    }
+}
+
+namespace xo {
+    namespace scm {
+        /** @class IGCObject_DArray
+         **/
+        class IGCObject_DArray {
+        public:
+            /** @defgroup scm-gcobject-darray-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-darray-methods **/
+            ///@{
+            // const methods
+            /** memory consumption for this instance **/
+            static size_type shallow_size(const DArray & self) noexcept;
+            /** copy instance using allocator **/
+            static Opaque shallow_copy(const DArray & self, obj<AAllocator> mm) noexcept;
+
+            // non-const methods
+            /** during GC: forward immdiate children **/
+            static size_type forward_children(DArray & self, obj<ACollector> gc) noexcept;
+            ///@}
+        };
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end */
\ No newline at end of file
diff --git a/xo-object2/src/object2/CMakeLists.txt b/xo-object2/src/object2/CMakeLists.txt
index 4c8645fe..3ab39f32 100644
--- a/xo-object2/src/object2/CMakeLists.txt
+++ b/xo-object2/src/object2/CMakeLists.txt
@@ -2,6 +2,7 @@
 
 set(SELF_LIB xo_object2)
 set(SELF_SRCS
+    IGCObject_DArray.cpp
     IGCObject_DFloat.cpp
     IGCObject_DInteger.cpp
     IGCObject_DList.cpp
diff --git a/xo-object2/src/object2/IGCObject_DArray.cpp b/xo-object2/src/object2/IGCObject_DArray.cpp
new file mode 100644
index 00000000..a2ee4bc1
--- /dev/null
+++ b/xo-object2/src/object2/IGCObject_DArray.cpp
@@ -0,0 +1,39 @@
+/** @file IGCObject_DArray.cpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [/home/roland/proj/xo-umbrella2-claude1/xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IGCObject_DArray.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_any.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IGCObject_DArray.json5]
+**/
+
+#include "array/IGCObject_DArray.hpp"
+
+namespace xo {
+    namespace scm {
+        auto
+        IGCObject_DArray::shallow_size(const DArray & self) noexcept -> size_type
+        {
+            return self.shallow_size();
+        }
+
+        auto
+        IGCObject_DArray::shallow_copy(const DArray & self, obj<AAllocator> mm) noexcept -> Opaque
+        {
+            return self.shallow_copy(mm);
+        }
+
+        auto
+        IGCObject_DArray::forward_children(DArray & self, obj<ACollector> gc) noexcept -> size_type
+        {
+            return self.forward_children(gc);
+        }
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end IGCObject_DArray.cpp */
\ No newline at end of file
diff --git a/xo-object2/src/object2/object2_register_facets.cpp b/xo-object2/src/object2/object2_register_facets.cpp
index 94cd7492..93438600 100644
--- a/xo-object2/src/object2/object2_register_facets.cpp
+++ b/xo-object2/src/object2/object2_register_facets.cpp
@@ -5,6 +5,7 @@
 
 #include "object2_register_facets.hpp"
 
+#include <xo/object2/array/IGCObject_DArray.hpp>
 #include <xo/object2/list/IGCObject_DList.hpp>
 #include <xo/object2/number/IGCObject_DFloat.hpp>
 #include <xo/object2/number/IGCObject_DInteger.hpp>
@@ -53,6 +54,7 @@ namespace xo {
             FacetRegistry::register_impl<AGCObject, DString>();
             FacetRegistry::register_impl<APrintable, DString>();
 
+            FacetRegistry::register_impl<AGCObject, DArray>();
             FacetRegistry::register_impl<ASequence, DArray>();
 
             log && log(xtag("DList.tseq", typeseq::id<DList>()));