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+/*
+  This file is part of Ingen.
+  Copyright 2007-2017 David Robillard <http://drobilla.net/>
+
+  Ingen is free software: you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or any later version.
+
+  Ingen 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 Affero General Public License for details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef INGEN_PROPERTIES_HPP
+#define INGEN_PROPERTIES_HPP
+
+#include "ingen/Atom.hpp"
+#include "ingen/URIs.hpp"
+
+#include <initializer_list>
+#include <map>
+#include <utility>
+
+namespace ingen {
+
+/** A property value (an Atom with a context). */
+class Property : public Atom {
+public:
+	enum class Graph {
+		DEFAULT,  ///< Default context for "universal" properties
+		EXTERNAL, ///< Externally visible graph properties
+		INTERNAL  ///< Internally visible graph properties
+	};
+
+	Property(const Atom& atom, Graph ctx=Graph::DEFAULT)
+		: Atom(atom)
+		, _ctx(ctx)
+	{}
+
+	Property(const URIs::Quark& quark, Graph ctx=Graph::DEFAULT)
+		: Atom(quark.urid)
+		, _ctx(ctx)
+	{}
+
+	Graph context() const        { return _ctx; }
+	void  set_context(Graph ctx) { _ctx = ctx; }
+
+private:
+	Graph _ctx;
+};
+
+class Properties : public std::multimap<URI, Property> {
+public:
+	using Graph = Property::Graph;
+
+	Properties() = default;
+	Properties(const Properties& copy) = default;
+
+	Properties(std::initializer_list<value_type> l)
+		: std::multimap<URI, Property>(l)
+	{}
+
+	void put(const URI&  key,
+	         const Atom& value,
+	         Graph       ctx = Graph::DEFAULT) {
+		emplace(key, Property(value, ctx));
+	}
+
+	void put(const URI&         key,
+	         const URIs::Quark& value,
+	         Graph              ctx = Graph::DEFAULT) {
+		emplace(key, Property(value, ctx));
+	}
+
+	bool contains(const URI& key, const Atom& value) {
+		for (const_iterator i = find(key); i != end() && i->first == key; ++i) {
+			if (i->second == value) {
+				return true;
+			}
+		}
+		return false;
+	}
+};
+
+} // namespace ingen
+
+#endif // INGEN_PROPERTIES_HPP