diff --git a/src/opt/hdf5/include/h5_content_base.h b/src/opt/hdf5/include/h5_content_base.h
index dace4d6..d838ae8 100644
--- a/src/opt/hdf5/include/h5_content_base.h
+++ b/src/opt/hdf5/include/h5_content_base.h
@@ -38,6 +38,13 @@ namespace CNORXZ
 	    RangePtr range() const;
 	    hid_t id() const;
 	    inline bool isOpen() const { return mId != 0; }
+
+	    template <typename T>
+	    ContentBase& addAttribute(const String& name, const T& value);
+	    DType getAttribute(const String& name) const;
+	    bool isAttribute(const String& name) const;
+	    String getAttributesAsString() const;
+	    String getRecursiveAttributesAsString() const; // + all parent's attributes
 	    
 	protected:
 	    String mName;
diff --git a/src/opt/hdf5/include/h5_group.cc.h b/src/opt/hdf5/include/h5_group.cc.h
index b1b1b50..033c2d2 100644
--- a/src/opt/hdf5/include/h5_group.cc.h
+++ b/src/opt/hdf5/include/h5_group.cc.h
@@ -3,6 +3,7 @@
 #define __cxz_h5_group_cc_h__
 
 #include "h5_group.h"
+#include "xpr/for.h"
 
 namespace CNORXZ
 {
@@ -54,6 +55,22 @@ namespace CNORXZ
 	    return *this;
 	}
 
+	template <class F>
+	decltype(auto) Group::iter(F&& f) const
+	{
+	    RangePtr gr = *mCont.range()->sub().begin();
+	    auto gi = std::make_shared<UIndex<String>>(gr);
+	    return gi->ifor( operation(std::forward<F>(f), mCont(gi)), NoF{} );
+	}
+
+	template <class F>
+	decltype(auto) Group::iterRecursive(F&& f) const
+	{
+	    return iter( [&](const auto& c) {
+		f(c);
+		recursion(c, std::forward<F>(f));
+	    });
+	}
     }
 }
 
diff --git a/src/opt/hdf5/include/h5_group.h b/src/opt/hdf5/include/h5_group.h
index 571c752..28c6616 100644
--- a/src/opt/hdf5/include/h5_group.h
+++ b/src/opt/hdf5/include/h5_group.h
@@ -41,8 +41,27 @@ namespace CNORXZ
 	    template <typename... Ts>
 	    Group& addTable(const String& name, const ArrayBase<Tuple<Ts...>>& data,
 			    const Vector<String>& fnames);
+
+	    template <class F>
+	    decltype(auto) iter(F&& f) const;
+
+	    template <class F>
+	    decltype(auto) iterRecursive(F&& f) const;
 	    
 	protected:
+
+	    template <typename C, class F>
+	    static void recursion(const C& c, F&& f)
+	    {
+		if(c->type() == ContentType::GROUP){
+		    auto cx = std::dynamic_pointer_cast<Group>(c);
+		    cx->open();
+		    if(cx->get().range() != nullptr){
+			cx->iterRecursive(std::forward<F>(f))();
+		    }
+		}
+	    }
+	    
 	    MArray<ContentPtr> mCont;
 
 	    void mkCont();
diff --git a/src/opt/hdf5/lib/h5_file.cc b/src/opt/hdf5/lib/h5_file.cc
index ec1452e..d1ba58c 100644
--- a/src/opt/hdf5/lib/h5_file.cc
+++ b/src/opt/hdf5/lib/h5_file.cc
@@ -67,7 +67,8 @@ namespace CNORXZ
 	
 	String File::path() const
 	{
-	    return String("/");
+	    //return String("/");
+	    return "";
 	}
 	
 	String File::filename() const
diff --git a/src/opt/hdf5/tests/h5_basic_unit_test.cc b/src/opt/hdf5/tests/h5_basic_unit_test.cc
index 6a3114a..a0f1ce8 100644
--- a/src/opt/hdf5/tests/h5_basic_unit_test.cc
+++ b/src/opt/hdf5/tests/h5_basic_unit_test.cc
@@ -39,7 +39,7 @@ namespace
 	Group_Test()
 	{
 	    mFileName = testh5file;
-	    mGrps = { "gr1", "gr2" };
+	    //mGrps = { "gr1", "gr2", "foo", "bar", "moregroups" };
 	    mFs = {"field1","second","real"};
 	    Vector<Tuple<SizeT,Int,Double>> v
 		( { {0, -6, 3.141},
@@ -53,7 +53,7 @@ namespace
 	}
 
 	String mFileName;
-	Vector<String> mGrps;
+	//Vector<String> mGrps;
 
 	Vector<String> mFs;
 	MArray<Tuple<SizeT,Int,Double>> mTabA; 
@@ -82,7 +82,15 @@ namespace
 	h5f.open();
 	h5f.addGroup("gr1");
 	h5f.addGroup("gr2");
-	EXPECT_EQ(h5f.get().size(), 2u);
+	h5f.addGroup("foo");
+	h5f.addGroup("moregroups");
+	h5f.addGroup("bar");
+	h5f.getGroup("moregroups")->open().addGroup("evenmore");
+	h5f.getGroup("moregroups")->getGroup("evenmore")->open().addGroup("we");
+	h5f.getGroup("moregroups")->getGroup("evenmore")->addGroup("need");
+	h5f.getGroup("moregroups")->getGroup("evenmore")->addGroup("more");
+	h5f.getGroup("moregroups")->getGroup("evenmore")->addGroup("groups");
+	EXPECT_EQ(h5f.get().size(), 5u);
 	h5f.close();
     }
 
@@ -100,14 +108,17 @@ namespace
 	File h5f(mFileName, true);
 	h5f.open();
 	EXPECT_TRUE(h5f.ro());
-	EXPECT_EQ(h5f.get().size(), 2u);
+	EXPECT_EQ(h5f.get().size(), 5u);
 	
 	EXPECT_THROW(h5f.getGroup("gr0"), std::runtime_error);
 	auto gr1 = h5f.getGroup("gr1");
 	gr1->open();
 	auto tab = gr1->getTable("tab1");
+	VCHECK(tab->path());
 	EXPECT_EQ(tab->fields()->size(), 3u);
 	EXPECT_EQ(tab->records()->size(), 5u);
+	h5f.iter( [](const auto& c) { VCHECK(c->path()); } )();
+	h5f.iterRecursive( [](const auto& c) { VCHECK(c->path()); } )();
 	h5f.close();
     }
 }