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diff --git a/libsolidity/interface/InterfaceHandler.h b/libsolidity/interface/InterfaceHandler.h
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+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @author Lefteris <lefteris@ethdev.com>
+ * @date 2014
+ * Takes the parsed AST and produces the Natspec
+ * documentation and the ABI interface
+ * https://github.com/ethereum/wiki/wiki/Ethereum-Natural-Specification-Format
+ *
+ * Can generally deal with JSON files
+ */
+
+#pragma once
+
+#include <string>
+#include <memory>
+#include <json/json.h>
+
+namespace dev
+{
+namespace solidity
+{
+
+// Forward declarations
+class ContractDefinition;
+struct DocTag;
+enum class DocumentationType: uint8_t;
+
+enum class DocTagType: uint8_t
+{
+	None = 0,
+	Dev,
+	Notice,
+	Param,
+	Return,
+	Author,
+	Title
+};
+
+enum class CommentOwner
+{
+	Contract,
+	Function
+};
+
+class InterfaceHandler
+{
+public:
+	/// Get the given type of documentation
+	/// @param _contractDef The contract definition
+	/// @param _type        The type of the documentation. Can be one of the
+	///                     types provided by @c DocumentationType
+	/// @return             A string with the json representation of provided type
+	static std::string documentation(
+		ContractDefinition const& _contractDef,
+		DocumentationType _type
+	);
+	/// Get the ABI Interface of the contract
+	/// @param _contractDef The contract definition
+	/// @return             A string with the json representation of the contract's ABI Interface
+	static std::string abiInterface(ContractDefinition const& _contractDef);
+	static std::string ABISolidityInterface(ContractDefinition const& _contractDef);
+	/// Get the User documentation of the contract
+	/// @param _contractDef The contract definition
+	/// @return             A string with the json representation of the contract's user documentation
+	static std::string userDocumentation(ContractDefinition const& _contractDef);
+	/// Genereates the Developer's documentation of the contract
+	/// @param _contractDef The contract definition
+	/// @return             A string with the json representation
+	///                     of the contract's developer documentation
+	static std::string devDocumentation(ContractDefinition const& _contractDef);
+
+private:
+	/// Returns concatenation of all content under the given tag name.
+	static std::string extractDoc(std::multimap<std::string, DocTag> const& _tags, std::string const& _name);
+};
+
+} //solidity NS
+} // dev NS