diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 4f6a654..57748fb 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -20,6 +20,7 @@ build_example(dynamic_library)
 build_example(event_trace)
 build_example(exception)
 build_example(logging)
+build_example(nlp)
 build_example(parse1)
 build_example(parse2)
 build_example(string)
diff --git a/examples/example_nlp.cpp b/examples/example_nlp.cpp
new file mode 100644
index 0000000..d14e0fe
--- /dev/null
+++ b/examples/example_nlp.cpp
@@ -0,0 +1,10 @@
+/**
+ * @copyright David Mott (c) 2016. Distributed under the Boost Software License Version 1.0. See LICENSE.md or http://boost.org/LICENSE_1_0.txt for details.
+ */
+
+#include <xtd/xtd.hpp>
+
+int main(){
+  INFO("Hello?");
+  return 0;
+}
diff --git a/include/xtd/btree.hpp b/include/xtd/btree.hpp
new file mode 100644
index 0000000..7b54bf9
--- /dev/null
+++ b/include/xtd/btree.hpp
@@ -0,0 +1,20 @@
+/** @file
+STL-ish map using on disk b-tree
+@copyright David Mott (c) 2016. Distributed under the Boost Software License Version 1.0. See LICENSE.md or http://boost.org/LICENSE_1_0.txt for details.
+*/
+
+
+namespace xtd{
+  template <typename _KeyT, typename _ValueT> class btree{
+
+  public:
+    using key_type = _KeyT;
+    using value_type = _ValueT;
+
+    bool insert(const key_type& key, const value_type& value){
+
+    }
+
+
+  };
+}
\ No newline at end of file
diff --git a/include/xtd/nlp/nlp.hpp b/include/xtd/nlp/nlp.hpp
index f28fecb..72f16a3 100644
--- a/include/xtd/nlp/nlp.hpp
+++ b/include/xtd/nlp/nlp.hpp
@@ -3,3 +3,8 @@ natural language processing
 @copyright David Mott (c) 2016. Distributed under the Boost Software License Version 1.0. See LICENSE.md or http://boost.org/LICENSE_1_0.txt for details.
 */
 
+namespace xtd{
+  namespace nlp{
+
+  }
+}
\ No newline at end of file