diff --git a/src/ast.cpp b/src/ast.cpp
index 0e40b9c..35bf1cb 100644
--- a/src/ast.cpp
+++ b/src/ast.cpp
@@ -18,6 +18,16 @@
     return this->m_name == b.m_name;
 }
 
+leaf_::leaf_(const std::string& name)
+    : m_name(name)
+{
+}
+
+bool leaf_::operator==(const leaf_& b) const
+{
+    return this->m_name == b.m_name;
+}
+
 listElement_::listElement_(const std::string& listName, const std::map<std::string, std::string>& keys)
     : m_name(listName)
     , m_keys(keys)
@@ -36,6 +46,11 @@
     return this->m_nodes == b.m_nodes;
 }
 
+bool set_::operator==(const set_& b) const
+{
+    return this->m_path == b.m_path && this->m_data == b.m_data;
+}
+
 bool cd_::operator==(const cd_& b) const
 {
     return this->m_path == b.m_path;
diff --git a/src/ast.hpp b/src/ast.hpp
index 417c3d7..9638684 100644
--- a/src/ast.hpp
+++ b/src/ast.hpp
@@ -54,6 +54,15 @@
     std::string m_name;
 };
 
+struct leaf_ {
+    leaf_() = default;
+    leaf_(const std::string& name);
+
+    bool operator==(const leaf_& b) const;
+
+    std::string m_name;
+};
+
 
 struct list_ {
     std::vector<std::string> m_keys;
@@ -72,7 +81,7 @@
 
 struct path_ {
     bool operator==(const path_& b) const;
-    std::vector<boost::variant<container_, listElement_, nodeup_>> m_nodes;
+    std::vector<boost::variant<container_, listElement_, nodeup_, leaf_>> m_nodes;
 };
 
 
@@ -91,7 +100,13 @@
     path_ m_path;
 };
 
-using command_ = boost::variant<cd_, create_, delete_>;
+struct set_ : x3::position_tagged {
+    bool operator==(const set_& b) const;
+    path_ m_path;
+    std::string m_data;
+};
+
+using command_ = boost::variant<cd_, create_, delete_, set_>;
 
 BOOST_FUSION_ADAPT_STRUCT(container_, m_name)
 BOOST_FUSION_ADAPT_STRUCT(listElement_, m_name, m_keys)
@@ -99,3 +114,4 @@
 BOOST_FUSION_ADAPT_STRUCT(cd_, m_path)
 BOOST_FUSION_ADAPT_STRUCT(create_, m_path)
 BOOST_FUSION_ADAPT_STRUCT(delete_, m_path)
+BOOST_FUSION_ADAPT_STRUCT(set_, m_path, m_data)
diff --git a/src/ast_handlers.hpp b/src/ast_handlers.hpp
index 1feeeab..4b703aa 100644
--- a/src/ast_handlers.hpp
+++ b/src/ast_handlers.hpp
@@ -98,7 +98,6 @@
     }
 };
 
-
 struct nodeup_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T&, Context const& context)
@@ -128,11 +127,43 @@
     }
 };
 
+struct leaf_class {
+    template <typename T, typename Iterator, typename Context>
+    void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
+    {
+        auto& parserContext = x3::get<parser_context_tag>(context);
+        const auto& schema = parserContext.m_schema;
+
+        if (schema.isLeaf(parserContext.m_curPath, ast.m_name)) {
+            parserContext.m_curPath.m_nodes.push_back(ast);
+        } else {
+            _pass(context) = false;
+        }
+    }
+};
+
 struct path_class {
     template <typename T, typename Iterator, typename Context>
     void on_success(Iterator const&, Iterator const&, T&, Context const&)
     {
     }
+
+    template <typename Iterator, typename Exception, typename Context>
+    x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const& x, Context const& context)
+    {
+        auto& parserContext = x3::get<parser_context_tag>(context);
+        auto& error_handler = x3::get<x3::error_handler_tag>(context).get();
+        std::string message = "invalid path.";
+        if (parserContext.m_errorHandled) // someone already handled our error
+            return x3::error_handler_result::fail;
+
+        parserContext.m_errorHandled = true;
+        error_handler(x.where(), message);
+        return x3::error_handler_result::fail;
+    }
+};
+
+struct data_string_class {
 };
 
 struct cd_class {
@@ -198,6 +229,33 @@
 struct delete_class : public presenceContainerPathHandler {
 };
 
+struct set_class {
+    template <typename T, typename Iterator, typename Context>
+    void on_success(Iterator const&, Iterator const&, T& ast, Context const& context)
+    {
+        try {
+            auto leaf = boost::get<leaf_>(ast.m_path.m_nodes.back());
+        } catch (boost::bad_get&) {
+            _pass(context) = false;
+            return;
+        }
+    }
+
+    template <typename Iterator, typename Exception, typename Context>
+    x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const& x, Context const& context)
+    {
+        auto& parserContext = x3::get<parser_context_tag>(context);
+        auto& error_handler = x3::get<x3::error_handler_tag>(context).get();
+        std::string message = "This isn't a path to leaf.";
+        if (parserContext.m_errorHandled) // someone already handled our error
+            return x3::error_handler_result::fail;
+
+        parserContext.m_errorHandled = true;
+        error_handler(x.where(), message);
+        return x3::error_handler_result::fail;
+    }
+};
+
 struct command_class {
     template <typename Iterator, typename Exception, typename Context>
     x3::error_handler_result on_error(Iterator&, Iterator const&, Exception const& x, Context const& context)
diff --git a/src/grammars.hpp b/src/grammars.hpp
index 30f69f1..9e4ea35 100644
--- a/src/grammars.hpp
+++ b/src/grammars.hpp
@@ -19,8 +19,11 @@
 x3::rule<listElement_class, listElement_> const listElement = "listElement";
 x3::rule<nodeup_class, nodeup_> const nodeup = "nodeup";
 x3::rule<container_class, container_> const container = "container";
+x3::rule<leaf_class, leaf_> const leaf = "leaf";
 x3::rule<path_class, path_> const path = "path";
+x3::rule<data_string_class, std::string> const data_string = "data_string";
 x3::rule<cd_class, cd_> const cd = "cd";
+x3::rule<set_class, set_> const set = "set";
 x3::rule<create_class, create_> const create = "create";
 x3::rule<delete_class, delete_> const delete_rule = "delete_rule";
 x3::rule<command_class, command_> const command = "command";
@@ -50,20 +53,33 @@
 auto const container_def =
         identifier;
 
+auto const leaf_def =
+        identifier;
+
+// leaf cannot be in the middle of a path, however, I need the grammar's attribute to be a vector of variants
 auto const path_def =
-        (container | listElement | nodeup) % '/';
+        (container | listElement | nodeup | leaf) % '/';
+
+auto const data_string_def =
+        lexeme[+char_];
+
+auto const space_separator =
+        x3::omit[x3::no_skip[space]];
 
 auto const cd_def =
-        lit("cd") > x3::omit[x3::no_skip[space]] > path >> x3::eoi;
+        lit("cd") > space_separator > path >> x3::eoi;
 
 auto const create_def =
-        lit("create") > x3::omit[x3::no_skip[space]] > path >> x3::eoi;
+        lit("create") > space_separator > path >> x3::eoi;
 
 auto const delete_rule_def =
-        lit("delete") > x3::omit[x3::no_skip[space]] > path >> x3::eoi;
+        lit("delete") > space_separator > path >> x3::eoi;
+
+auto const set_def =
+        lit("set") > space_separator > path > space_separator > data_string >> x3::eoi;
 
 auto const command_def =
-        cd | create | delete_rule;
+        cd | create | delete_rule | set;
 
 BOOST_SPIRIT_DEFINE(keyValue)
 BOOST_SPIRIT_DEFINE(identifier)
@@ -72,7 +88,10 @@
 BOOST_SPIRIT_DEFINE(listElement)
 BOOST_SPIRIT_DEFINE(nodeup)
 BOOST_SPIRIT_DEFINE(container)
+BOOST_SPIRIT_DEFINE(leaf)
 BOOST_SPIRIT_DEFINE(path)
+BOOST_SPIRIT_DEFINE(data_string)
+BOOST_SPIRIT_DEFINE(set)
 BOOST_SPIRIT_DEFINE(cd)
 BOOST_SPIRIT_DEFINE(create)
 BOOST_SPIRIT_DEFINE(delete_rule)
diff --git a/src/interpreter.cpp b/src/interpreter.cpp
index 5c132d1..44c0b2f 100644
--- a/src/interpreter.cpp
+++ b/src/interpreter.cpp
@@ -9,6 +9,11 @@
 #include <iostream>
 #include "interpreter.hpp"
 
+void Interpreter::operator()(const set_& set) const
+{
+    std::cout << "Setting " << boost::get<leaf_>(set.m_path.m_nodes.back()).m_name << " to " << set.m_data << std::endl;
+}
+
 void Interpreter::operator()(const cd_& cd) const
 {
     m_parser.changeNode(cd.m_path);
diff --git a/src/interpreter.hpp b/src/interpreter.hpp
index a4a5cc0..64cc0e9 100644
--- a/src/interpreter.hpp
+++ b/src/interpreter.hpp
@@ -14,6 +14,7 @@
 struct Interpreter : boost::static_visitor<void> {
     Interpreter(Parser& parser, Schema&);
 
+    void operator()(const set_&) const;
     void operator()(const cd_&) const;
     void operator()(const create_&) const;
     void operator()(const delete_&) const;
diff --git a/src/main.cpp b/src/main.cpp
index 4fb9d8d..df4c925 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -49,7 +49,9 @@
     Schema schema;
     schema.addContainer("", "a", yang::ContainerTraits::Presence);
     schema.addContainer("", "b");
+    schema.addLeaf("", "leaf");
     schema.addContainer("a", "a2");
+    schema.addLeaf("a", "leafa");
     schema.addContainer("b", "b2", yang::ContainerTraits::Presence);
     schema.addContainer("a/a2", "a3", yang::ContainerTraits::Presence);
     schema.addContainer("b/b2", "b3");
diff --git a/src/schema.cpp b/src/schema.cpp
index fa72f81..9832c45 100644
--- a/src/schema.cpp
+++ b/src/schema.cpp
@@ -115,3 +115,17 @@
     std::string locationString = pathToString(location);
     return boost::get<yang::container>(children(locationString).at(name)).m_presence == yang::ContainerTraits::Presence;
 }
+
+void Schema::addLeaf(const std::string& location, const std::string& name)
+{
+    m_nodes.at(location).emplace(name, yang::leaf{});
+}
+
+bool Schema::isLeaf(const path_& location, const std::string& name) const
+{
+    std::string locationString = pathToString(location);
+    if (!nodeExists(locationString, name))
+        return false;
+
+    return children(locationString).at(name).type() == typeid(yang::leaf);
+}
diff --git a/src/schema.hpp b/src/schema.hpp
index 9c7114b..487f820 100644
--- a/src/schema.hpp
+++ b/src/schema.hpp
@@ -25,10 +25,12 @@
 struct list {
     std::set<std::string> m_keys;
 };
+struct leaf {
+};
 }
 
 
-using NodeType = boost::variant<yang::container, yang::list>;
+using NodeType = boost::variant<yang::container, yang::list, yang::leaf>;
 
 
 class InvalidNodeException : public std::invalid_argument {
@@ -52,6 +54,8 @@
     bool isList(const path_& location, const std::string& name) const;
     void addList(const std::string& location, const std::string& name, const std::set<std::string>& keys);
     bool isPresenceContainer(const path_& location, const std::string& name) const;
+    void addLeaf(const std::string& location, const std::string& name);
+    bool isLeaf(const path_& location, const std::string& name) const;
 
 private:
     const std::unordered_map<std::string, NodeType>& children(const std::string& name) const;