diff --git a/xo-type/CMakeLists.txt b/xo-type/CMakeLists.txt
index b1ea2905..7a318537 100644
--- a/xo-type/CMakeLists.txt
+++ b/xo-type/CMakeLists.txt
@@ -70,6 +70,26 @@ xo_add_genfacetimpl(
 
 # ----------------------------------------------------------------
 
+# note: manual target; generated code committed to git
+xo_add_genfacetimpl(
+    TARGET xo-type-facetimpl-type-arraytype
+    FACET_PKG xo_type
+    FACET Type
+    REPR ArrayType
+    INPUT idl/IType_DArrayType.json5
+)
+
+# note: manual target; generated code committed to git
+xo_add_genfacetimpl(
+    TARGET xo-type-facetimpl-gcobject-arraytype
+    FACET_PKG xo_alloc2
+    FACET GCObject
+    REPR ArrayType
+    INPUT idl/IGCObject_DArrayType.json5
+)
+
+# ----------------------------------------------------------------
+
 xo_add_genfacet_all(xo-type-genfacet-all)
 
 install(DIRECTORY idl/
diff --git a/xo-type/idl/IGCObject_DArrayType.json5 b/xo-type/idl/IGCObject_DArrayType.json5
new file mode 100644
index 00000000..77e59249
--- /dev/null
+++ b/xo-type/idl/IGCObject_DArrayType.json5
@@ -0,0 +1,16 @@
+{
+    mode: "implementation",
+    output_cpp_dir: "src/type",
+    output_hpp_dir: "include/xo/type",
+    output_impl_subdir: "array",
+    includes: [
+    ],
+    local_types: [ ],
+    namespace1: "xo",
+    namespace2: "scm",
+    facet_idl: "idl/GCObject.json5",
+    brief: "provide AGCObject interface for DArrayType",
+    using_doxygen: true,
+    repr: "DArrayType",
+    doc: [ "implement AGCObject for DArrayType" ],
+}
diff --git a/xo-type/idl/IType_DArrayType.json5 b/xo-type/idl/IType_DArrayType.json5
new file mode 100644
index 00000000..b84ab477
--- /dev/null
+++ b/xo-type/idl/IType_DArrayType.json5
@@ -0,0 +1,16 @@
+{
+    mode: "implementation",
+    output_cpp_dir: "src/type",
+    output_hpp_dir: "include/xo/type",
+    output_impl_subdir: "array",
+    includes: [],
+    local_types: [],
+    namespace1: "xo",
+    namespace2: "scm",
+
+    facet_idl: "idl/Type.json5",
+    brief: "provide AType interface for DArrayType",
+    using_doxygen: true,
+    repr: "DArrayType",
+    doc: [ "implement AType for DArrayType" ],
+}
diff --git a/xo-type/include/xo/type/ArrayType.hpp b/xo-type/include/xo/type/ArrayType.hpp
new file mode 100644
index 00000000..f0c5aa7a
--- /dev/null
+++ b/xo-type/include/xo/type/ArrayType.hpp
@@ -0,0 +1,12 @@
+/** @file ArrayType.hpp
+ *
+ *  @author Roland Conybeare, Mar 2026
+ **/
+
+#pragma once
+
+#include "DArrayType.hpp"
+#include "array/IType_DArrayType.hpp"
+#include "array/IGCObject_DArrayType.hpp"
+
+/* end ArrayType.hpp */
diff --git a/xo-type/include/xo/type/DArrayType.hpp b/xo-type/include/xo/type/DArrayType.hpp
new file mode 100644
index 00000000..945f7f0a
--- /dev/null
+++ b/xo-type/include/xo/type/DArrayType.hpp
@@ -0,0 +1,60 @@
+/** @file DArrayType.hpp
+ *
+ *  @author Roland Conybeare, Mar 2026
+ **/
+
+#pragma once
+
+#include "Type.hpp"
+#include "Metatype.hpp"
+#include <xo/alloc2/Collector.hpp>
+#include <xo/alloc2/Allocator.hpp>
+
+namespace xo {
+    namespace scm {
+        /** @brief A parameterized array type: array(T)
+         *
+         *  Represents a fixed-size homogeneous collection.
+         **/
+        class DArrayType {
+        public:
+            using ACollector = xo::mm::ACollector;
+            using AAllocator = xo::mm::AAllocator;
+
+        public:
+            /** @defgroup xo-scm-arraytype-ctors **/
+            ///@{
+
+            explicit DArrayType(obj<AType> elt);
+
+            /** create instance using memory from @p mm with element type @p elt_type **/
+            static DArrayType * _make(obj<AAllocator> mm, obj<AType> elt_type);
+
+            ///@}
+            /** @defgroup xo-scm-arraytype-type-facet **/
+            ///@{
+            Metatype metatype() const noexcept { return Metatype::array(); }
+            bool is_equal_to(const obj<AType> & y) const noexcept;
+            bool is_subtype_of(const obj<AType> & y) const noexcept;
+            ///@}
+            /** @defgroup xo-scm-arraytype-gcobject-facet **/
+            ///@{
+            std::size_t shallow_size() const noexcept;
+            DArrayType * shallow_copy(obj<AAllocator> mm) const noexcept;
+            std::size_t forward_children(obj<ACollector> gc) noexcept;
+            ///@}
+
+        private:
+            /** @defgroup xo-scm-arraytype-member-vars **/
+            ///@{
+
+            /** all array elements satisfy @ref elt_type_ **/
+            obj<AType> elt_type_;
+
+            ///@}
+        };
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end DArrayType.hpp */
diff --git a/xo-type/include/xo/type/Metatype.hpp b/xo-type/include/xo/type/Metatype.hpp
index 2d7b2a5d..e1119801 100644
--- a/xo-type/include/xo/type/Metatype.hpp
+++ b/xo-type/include/xo/type/Metatype.hpp
@@ -46,6 +46,7 @@ namespace xo {
             static Metatype any() { return Metatype(code::t_any); }
 
             static Metatype list() { return Metatype(code::t_list); }
+            static Metatype array() { return Metatype(code::t_array); }
 
             /** description string for this type category **/
             const char * _descr() const noexcept;
diff --git a/xo-type/include/xo/type/TypeOps.hpp b/xo-type/include/xo/type/TypeOps.hpp
index b31fa039..8877ae8d 100644
--- a/xo-type/include/xo/type/TypeOps.hpp
+++ b/xo-type/include/xo/type/TypeOps.hpp
@@ -5,6 +5,7 @@
 
 #include "AtomicType.hpp"
 #include "ListType.hpp"
+#include "ArrayType.hpp"
 #include <xo/alloc2/Allocator.hpp>
 
 namespace xo {
@@ -23,6 +24,11 @@ namespace xo {
             static obj<AFacet,DListType> list_type(obj<AAllocator> mm, obj<AType> elt_type) {
                 return obj<AFacet,DListType>(DListType::_make(mm, elt_type));
             }
+
+            template <typename AFacet = AType>
+            static obj<AFacet,DArrayType> array_type(obj<AAllocator> mm, obj<AType> elt_type) {
+                return obj<AFacet,DArrayType>(DArrayType::_make(mm, elt_type));
+            }
         };
 
     } /*namespace scm*/
diff --git a/xo-type/include/xo/type/array/IGCObject_DArrayType.hpp b/xo-type/include/xo/type/array/IGCObject_DArrayType.hpp
new file mode 100644
index 00000000..bb71960f
--- /dev/null
+++ b/xo-type/include/xo/type/array/IGCObject_DArrayType.hpp
@@ -0,0 +1,65 @@
+/** @file IGCObject_DArrayType.hpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IGCObject_DArrayType.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_repr.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IGCObject_DArrayType.json5]
+ **/
+
+#pragma once
+
+#include "GCObject.hpp"
+#include "DArrayType.hpp"
+
+namespace xo { namespace scm { class IGCObject_DArrayType; } }
+
+namespace xo {
+    namespace facet {
+        template <>
+        struct FacetImplementation<xo::mm::AGCObject,
+                                   xo::scm::DArrayType>
+        {
+            using ImplType = xo::mm::IGCObject_Xfer
+              <xo::scm::DArrayType,
+               xo::scm::IGCObject_DArrayType>;
+        };
+    }
+}
+
+namespace xo {
+    namespace scm {
+        /** @class IGCObject_DArrayType
+         **/
+        class IGCObject_DArrayType {
+        public:
+            /** @defgroup scm-gcobject-darraytype-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-darraytype-methods **/
+            ///@{
+            // const methods
+            /** memory consumption for this instance **/
+            static size_type shallow_size(const DArrayType & self) noexcept;
+            /** copy instance using allocator **/
+            static Opaque shallow_copy(const DArrayType & self, obj<AAllocator> mm) noexcept;
+
+            // non-const methods
+            /** during GC: forward immdiate children **/
+            static size_type forward_children(DArrayType & self, obj<ACollector> gc) noexcept;
+            ///@}
+        };
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end */
\ No newline at end of file
diff --git a/xo-type/include/xo/type/array/IType_DArrayType.hpp b/xo-type/include/xo/type/array/IType_DArrayType.hpp
new file mode 100644
index 00000000..e323931b
--- /dev/null
+++ b/xo-type/include/xo/type/array/IType_DArrayType.hpp
@@ -0,0 +1,63 @@
+/** @file IType_DArrayType.hpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IType_DArrayType.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_repr.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IType_DArrayType.json5]
+ **/
+
+#pragma once
+
+#include "Type.hpp"
+#include "DArrayType.hpp"
+
+namespace xo { namespace scm { class IType_DArrayType; } }
+
+namespace xo {
+    namespace facet {
+        template <>
+        struct FacetImplementation<xo::scm::AType,
+                                   xo::scm::DArrayType>
+        {
+            using ImplType = xo::scm::IType_Xfer
+              <xo::scm::DArrayType,
+               xo::scm::IType_DArrayType>;
+        };
+    }
+}
+
+namespace xo {
+    namespace scm {
+        /** @class IType_DArrayType
+         **/
+        class IType_DArrayType {
+        public:
+            /** @defgroup scm-type-darraytype-type-traits **/
+            ///@{
+            using obj_AType = xo::scm::AType::obj_AType;
+            using Copaque = xo::scm::AType::Copaque;
+            using Opaque = xo::scm::AType::Opaque;
+            ///@}
+            /** @defgroup scm-type-darraytype-methods **/
+            ///@{
+            // const methods
+            /** category for this type **/
+            static Metatype metatype(const DArrayType & self) noexcept;
+            /** true iff this type is equal to y **/
+            static bool is_equal_to(const DArrayType & self, const obj_AType & y);
+            /** true iff this is a subtype of y **/
+            static bool is_subtype_of(const DArrayType & self, const obj_AType & y);
+
+            // non-const methods
+            ///@}
+        };
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end */
\ No newline at end of file
diff --git a/xo-type/src/type/CMakeLists.txt b/xo-type/src/type/CMakeLists.txt
index 7f708fb4..d00c30bf 100644
--- a/xo-type/src/type/CMakeLists.txt
+++ b/xo-type/src/type/CMakeLists.txt
@@ -9,11 +9,14 @@ set(SELF_SRCS
     Metatype.cpp
     DAtomicType.cpp
     DListType.cpp
+    DArrayType.cpp
     IType_Any.cpp
     IType_DAtomicType.cpp
     IType_DListType.cpp
+    IType_DArrayType.cpp
     IGCObject_DAtomicType.cpp
     IGCObject_DListType.cpp
+    IGCObject_DArrayType.cpp
 )
 
 xo_add_shared_library4(${SELF_LIB} ${PROJECT_NAME}Targets ${PROJECT_VERSION} 1 ${SELF_SRCS})
diff --git a/xo-type/src/type/DArrayType.cpp b/xo-type/src/type/DArrayType.cpp
new file mode 100644
index 00000000..de5320e2
--- /dev/null
+++ b/xo-type/src/type/DArrayType.cpp
@@ -0,0 +1,92 @@
+/** @file DArrayType.cpp
+ *
+ *  @author Roland Conybeare, Mar 2026
+ **/
+
+#include "Type.hpp"
+#include "ArrayType.hpp"
+#include <xo/alloc2/Collector.hpp>
+#include <xo/alloc2/Allocator.hpp>
+#include <xo/facet/FacetRegistry.hpp>
+
+namespace xo {
+    using xo::mm::AGCObject;
+    using xo::mm::AAllocator;
+    using xo::facet::FacetRegistry;
+
+    namespace scm {
+
+        DArrayType::DArrayType(obj<AType> elt) : elt_type_{elt} {}
+
+        DArrayType *
+        DArrayType::_make(obj<AAllocator> mm,
+                          obj<AType> elt_type)
+        {
+            void * mem = mm.alloc_for<DArrayType>();
+
+            return new (mem) DArrayType(elt_type);
+        }
+
+        // ----- type facet -----
+
+        bool
+        DArrayType::is_equal_to(const obj<AType> & y_arg) const noexcept
+        {
+            Metatype y_mtype = y_arg.metatype();
+
+            if (y_mtype != Metatype::array())
+                return false;
+
+            auto y = obj<AType,DArrayType>::from(y_arg);
+
+            obj<AType> e = elt_type_;
+
+            return (e.is_equal_to(y->elt_type_));
+        }
+
+        bool
+        DArrayType::is_subtype_of(const obj<AType> & y_arg) const noexcept
+        {
+            Metatype y_mtype = y_arg.metatype();
+
+            if (y_mtype == Metatype::any())
+                return true;
+
+            if (y_mtype != Metatype::array())
+                return false;
+
+            auto y = obj<AType,DArrayType>::from(y_arg);
+
+            obj<AType> e = elt_type_;
+
+            return (e.is_subtype_of(y->elt_type_));
+        }
+
+        // ----- gcobject facet -----
+
+        std::size_t
+        DArrayType::shallow_size() const noexcept
+        {
+            return sizeof(*this);
+        }
+
+        DArrayType *
+        DArrayType::shallow_copy(obj<AAllocator> mm) const noexcept
+        {
+            return mm.std_copy_for(this);
+        }
+
+        std::size_t
+        DArrayType::forward_children(obj<ACollector> gc) noexcept
+        {
+            {
+                auto e = FacetRegistry::instance().variant<AGCObject,AType>(elt_type_);
+                gc.forward_inplace(e.iface(), (void **)&(e.data_));
+            }
+
+            return this->shallow_size();
+        }
+    }
+}
+
+/* end DArrayType.cpp */
diff --git a/xo-type/src/type/IGCObject_DArrayType.cpp b/xo-type/src/type/IGCObject_DArrayType.cpp
new file mode 100644
index 00000000..936f8eec
--- /dev/null
+++ b/xo-type/src/type/IGCObject_DArrayType.cpp
@@ -0,0 +1,39 @@
+/** @file IGCObject_DArrayType.cpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IGCObject_DArrayType.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_any.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IGCObject_DArrayType.json5]
+**/
+
+#include "array/IGCObject_DArrayType.hpp"
+
+namespace xo {
+    namespace scm {
+        auto
+        IGCObject_DArrayType::shallow_size(const DArrayType & self) noexcept -> size_type
+        {
+            return self.shallow_size();
+        }
+
+        auto
+        IGCObject_DArrayType::shallow_copy(const DArrayType & self, obj<AAllocator> mm) noexcept -> Opaque
+        {
+            return self.shallow_copy(mm);
+        }
+
+        auto
+        IGCObject_DArrayType::forward_children(DArrayType & self, obj<ACollector> gc) noexcept -> size_type
+        {
+            return self.forward_children(gc);
+        }
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end IGCObject_DArrayType.cpp */
diff --git a/xo-type/src/type/IType_DArrayType.cpp b/xo-type/src/type/IType_DArrayType.cpp
new file mode 100644
index 00000000..2ed60101
--- /dev/null
+++ b/xo-type/src/type/IType_DArrayType.cpp
@@ -0,0 +1,40 @@
+/** @file IType_DArrayType.cpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IType_DArrayType.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_any.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IType_DArrayType.json5]
+**/
+
+#include "array/IType_DArrayType.hpp"
+
+namespace xo {
+    namespace scm {
+        auto
+        IType_DArrayType::metatype(const DArrayType & self) noexcept -> Metatype
+        {
+            return self.metatype();
+        }
+
+        auto
+        IType_DArrayType::is_equal_to(const DArrayType & self, const obj_AType & y) -> bool
+        {
+            return self.is_equal_to(y);
+        }
+
+        auto
+        IType_DArrayType::is_subtype_of(const DArrayType & self, const obj_AType & y) -> bool
+        {
+            return self.is_subtype_of(y);
+        }
+
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end IType_DArrayType.cpp */
diff --git a/xo-type/src/type/type_register_facets.cpp b/xo-type/src/type/type_register_facets.cpp
index 549633cd..8cebc6f0 100644
--- a/xo-type/src/type/type_register_facets.cpp
+++ b/xo-type/src/type/type_register_facets.cpp
@@ -7,6 +7,7 @@
 
 #include <xo/type/AtomicType.hpp>
 #include <xo/type/ListType.hpp>
+#include <xo/type/ArrayType.hpp>
 #include <xo/facet/FacetRegistry.hpp>
 #include <xo/indentlog/scope.hpp>
 
@@ -28,8 +29,12 @@ namespace xo {
             FacetRegistry::register_impl<AType, DListType>();
             FacetRegistry::register_impl<AGCObject, DListType>();
 
+            FacetRegistry::register_impl<AType, DArrayType>();
+            FacetRegistry::register_impl<AGCObject, DArrayType>();
+
             log && log(xtag("DAtomicType.tseq", typeseq::id<DAtomicType>()));
             log && log(xtag("DListType.tseq", typeseq::id<DListType>()));
+            log && log(xtag("DArrayType.tseq", typeseq::id<DArrayType>()));
 
             return true;
         }
diff --git a/xo-type/src/type/type_register_types.cpp b/xo-type/src/type/type_register_types.cpp
index 8e2cdda6..884de0cd 100644
--- a/xo-type/src/type/type_register_types.cpp
+++ b/xo-type/src/type/type_register_types.cpp
@@ -7,6 +7,7 @@
 
 #include "AtomicType.hpp"
 #include "ListType.hpp"
+#include "ArrayType.hpp"
 #include <xo/alloc2/Collector.hpp>
 #include <xo/facet/FacetRegistry.hpp>
 #include <xo/indentlog/scope.hpp>
@@ -27,6 +28,7 @@ namespace xo {
 
             ok &= gc.install_type(impl_for<AGCObject, DAtomicType>());
             ok &= gc.install_type(impl_for<AGCObject, DListType>());
+            ok &= gc.install_type(impl_for<AGCObject, DArrayType>());
 
             return ok;
         }
diff --git a/xo-type/utest/CMakeLists.txt b/xo-type/utest/CMakeLists.txt
index cc18708a..6ddf4ce4 100644
--- a/xo-type/utest/CMakeLists.txt
+++ b/xo-type/utest/CMakeLists.txt
@@ -5,6 +5,7 @@ set(UTEST_SRCS
     type_utest_main.cpp
     DAtomicType.test.cpp
     DListType.test.cpp
+    DArrayType.test.cpp
 #    DString.test.cpp
 #    StringOps.test.cpp
 #    X1Collector.test.cpp
diff --git a/xo-type/utest/DArrayType.test.cpp b/xo-type/utest/DArrayType.test.cpp
new file mode 100644
index 00000000..fc4ed8cb
--- /dev/null
+++ b/xo-type/utest/DArrayType.test.cpp
@@ -0,0 +1,70 @@
+/** @file DArrayType.test.cpp
+ *
+ *  @author Roland Conybeare, Mar 2026
+ **/
+
+#include "init_type.hpp"
+#include "TypeOps.hpp"
+#include "ArrayType.hpp"
+#include "ListType.hpp"
+#include "AtomicType.hpp"
+#include <xo/alloc2/Allocator.hpp>
+#include <xo/alloc2/Arena.hpp>
+#include <xo/facet/obj.hpp>
+#include <catch2/catch.hpp>
+
+namespace xo {
+    using xo::scm::TypeOps;
+    using xo::scm::AType;
+    using xo::scm::Metatype;
+    using xo::mm::AAllocator;
+    using xo::mm::DArena;
+    using xo::mm::ArenaConfig;
+
+    namespace ut {
+        static InitEvidence s_init = (InitSubsys<S_type_tag>::require());
+
+        TEST_CASE("DArrayType-make", "[type][DArrayType]")
+        {
+            ArenaConfig cfg { .name_ = "testarena",
+                              .size_ = 4*1024 };
+            DArena arena = DArena::map(cfg);
+            auto alloc = obj<AAllocator,DArena>(&arena);
+
+            auto i64_type = TypeOps::atomic_type(alloc, Metatype::i64());
+            auto array_i64_type = TypeOps::array_type(alloc, i64_type);
+
+            REQUIRE(array_i64_type);
+            REQUIRE(array_i64_type.is_equal_to(array_i64_type));
+
+            auto bool_type = TypeOps::atomic_type(alloc, Metatype::t_bool());
+            auto array_bool_type = TypeOps::array_type(alloc, bool_type);
+
+            REQUIRE(array_bool_type);
+            REQUIRE(array_bool_type.is_equal_to(array_bool_type));
+
+            auto any_type = TypeOps::atomic_type(alloc, Metatype::any());
+            auto array_any_type = TypeOps::array_type(alloc, any_type);
+
+            REQUIRE(array_any_type);
+            REQUIRE(array_any_type.is_equal_to(array_any_type));
+
+            REQUIRE(array_bool_type.is_subtype_of(array_any_type));
+            REQUIRE(array_i64_type.is_subtype_of(array_any_type));
+
+            REQUIRE(!array_i64_type.is_subtype_of(array_bool_type));
+            REQUIRE(!array_any_type.is_subtype_of(array_bool_type));
+            REQUIRE(!array_bool_type.is_subtype_of(array_i64_type));
+            REQUIRE(!array_any_type.is_subtype_of(array_i64_type));
+
+            // array and list are unrelated
+            auto list_i64_type = TypeOps::list_type(alloc, i64_type);
+            REQUIRE(!array_i64_type.is_equal_to(list_i64_type));
+            REQUIRE(!array_i64_type.is_subtype_of(list_i64_type));
+            REQUIRE(!list_i64_type.is_subtype_of(array_i64_type));
+        }
+    }
+}
+
+
+/* end DArrayType.test.cpp */