diff --git a/include/xo/reflect/vector/VectorTdx.hpp b/include/xo/reflect/vector/VectorTdx.hpp
index 944c451..84e414b 100644
--- a/include/xo/reflect/vector/VectorTdx.hpp
+++ b/include/xo/reflect/vector/VectorTdx.hpp
@@ -9,87 +9,87 @@
 #include "xo/reflect/EstablishTypeDescr.hpp"
 
 namespace xo {
-  namespace reflect {
-    /* Extra type-associated information for a vector/array.
-     */
-    class VectorTdx : public TypeDescrExtra {
-    public:
-      /* named ctor idiom.  create new instance for a vector type */
-      //static std::unique_ptr<VectorTdx> make();
+    namespace reflect {
+        /* Extra type-associated information for a vector/array.
+         */
+        class VectorTdx : public TypeDescrExtra {
+        public:
+            /* named ctor idiom.  create new instance for a vector type */
+            //static std::unique_ptr<VectorTdx> make();
 
-      // ----- Inherited from TypeDescrExtra -----
+            // ----- Inherited from TypeDescrExtra -----
 
-      virtual Metatype metatype() const override { return Metatype::mt_vector; }
-      virtual uint32_t n_child(void * object) const override = 0;
-      virtual TaggedPtr child_tp(uint32_t i, void * object) const override = 0;
-      /* (forbidden) */
-      virtual std::string const & struct_member_name(uint32_t i) const override;
-    }; /*VectorTdx*/
+            virtual Metatype metatype() const override { return Metatype::mt_vector; }
+            virtual uint32_t n_child(void * object) const override = 0;
+            virtual TaggedPtr child_tp(uint32_t i, void * object) const override = 0;
+            /* (forbidden) */
+            virtual std::string const & struct_member_name(uint32_t i) const override;
+        }; /*VectorTdx*/
 
-    // ----- StlVectorTdx -----
+        // ----- StlVectorTdx -----
 
-    /* require:
-     * - VectorT.size()
-     * - VectorT[int] :: lvalue
-     */
-    template<typename VectorT>
-    class StlVectorTdx : public VectorTdx {
-    public:
-      using target_t = VectorT;
+        /* require:
+         * - VectorT.size()
+         * - VectorT[int] :: lvalue
+         */
+        template<typename VectorT>
+        class StlVectorTdx : public VectorTdx {
+        public:
+            using target_t = VectorT;
 
-      static std::unique_ptr<StlVectorTdx> make() {
-    return std::unique_ptr<StlVectorTdx>(new StlVectorTdx());
-      } /*make*/
+            static std::unique_ptr<StlVectorTdx> make() {
+                return std::unique_ptr<StlVectorTdx>(new StlVectorTdx());
+            } /*make*/
 
-      virtual uint32_t n_child(void * object) const override {
-    target_t * vec = reinterpret_cast<target_t *>(object);
+            virtual uint32_t n_child(void * object) const override {
+                target_t * vec = reinterpret_cast<target_t *>(object);
 
-    return vec->size();
-      } /*n_child*/
+                return vec->size();
+            } /*n_child*/
 
-      virtual TaggedPtr child_tp(uint32_t i, void * object) const override {
-    target_t * vec = reinterpret_cast<target_t *>(object);
+            virtual TaggedPtr child_tp(uint32_t i, void * object) const override {
+                target_t * vec = reinterpret_cast<target_t *>(object);
 
-    return establish_most_derived_tp(&((*vec)[i]));
-      } /*child_tp*/
-    }; /*StlVectorTdx*/
+                return establish_most_derived_tp(&((*vec)[i]));
+            } /*child_tp*/
+        }; /*StlVectorTdx*/
 
-    // ----- std::array<Element, N> -----
+        // ----- std::array<Element, N> -----
 
-    /* coordinates with EstablishTdx<std::array<Element, N>>::make(),
-     * see [reflect/Reflect.hpp]
-     */
+        /* coordinates with EstablishTdx<std::array<Element, N>>::make(),
+         * see [reflect/Reflect.hpp]
+         */
 
-    template<typename Element, std::size_t N>
-    using StdArrayTdx = StlVectorTdx<std::array<Element, N>>;
+        template<typename Element, std::size_t N>
+        using StdArrayTdx = StlVectorTdx<std::array<Element, N>>;
 
-    // ----- std::vector<Element> -----
+        // ----- std::vector<Element> -----
 
-    /* coordinates with EstablishTdx<std::vector<Element>>::make()
-     * see [reflect/Reflect.hpp]
-     */
-    template<typename Element>
-    class StdVectorTdx : public VectorTdx {
-    public:
-      using target_t = std::vector<Element>;
+        /* coordinates with EstablishTdx<std::vector<Element>>::make()
+         * see [reflect/Reflect.hpp]
+         */
+        template<typename Element>
+        class StdVectorTdx : public VectorTdx {
+        public:
+            using target_t = std::vector<Element>;
 
-      static std::unique_ptr<StdVectorTdx> make() {
-    return std::unique_ptr<StdVectorTdx>(new StdVectorTdx());
-      } /*make*/
+            static std::unique_ptr<StdVectorTdx> make() {
+                return std::unique_ptr<StdVectorTdx>(new StdVectorTdx());
+            } /*make*/
 
-      virtual uint32_t n_child(void * object) const override {
-    target_t * vec = reinterpret_cast<target_t *>(object);
+            virtual uint32_t n_child(void * object) const override {
+                target_t * vec = reinterpret_cast<target_t *>(object);
 
-    return vec->size();
-      } /*n_child*/
+                return vec->size();
+            } /*n_child*/
 
-      virtual TaggedPtr child_tp(uint32_t i, void * object) const override {
-    target_t * vec = reinterpret_cast<target_t *>(object);
+            virtual TaggedPtr child_tp(uint32_t i, void * object) const override {
+                target_t * vec = reinterpret_cast<target_t *>(object);
 
-    return establish_most_derived_tp(&((*vec)[i]));
-      }
-    }; /*StdVectorTdx*/
-  } /*namespace reflect*/
+                return establish_most_derived_tp(&((*vec)[i]));
+            }
+        }; /*StdVectorTdx*/
+    } /*namespace reflect*/
 
 } /*namespace xo*/