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diff --git a/include/ixion/document.hpp b/include/ixion/document.hpp
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+++ b/include/ixion/document.hpp
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_IXION_DOCUMENT_HPP
+#define INCLUDED_IXION_DOCUMENT_HPP
+
+#include "types.hpp"
+#include "address.hpp"
+
+#include <memory>
+#include <string>
+#include <variant>
+
+namespace ixion {
+
+class cell_access;
+
+/**
+ * Higher level document representation designed to handle both cell value
+ * storage as well as formula cell calculations.
+ */
+class IXION_DLLPUBLIC document
+{
+    struct impl;
+    std::unique_ptr<impl> mp_impl;
+public:
+    document();
+
+    /**
+     * Constructor with custom cell address type.
+     *
+     * @param cell_address_type cell address type to use for cell addresses
+     *                          represented by string values.
+     */
+    document(formula_name_resolver_t cell_address_type);
+    ~document();
+
+    struct IXION_DLLPUBLIC cell_pos
+    {
+        enum class cp_type { string, address };
+        cp_type type;
+
+        std::variant<std::string_view, ixion::abs_address_t> value;
+
+        cell_pos(const char* p);
+        cell_pos(const char* p, size_t n);
+        cell_pos(const std::string& s);
+        cell_pos(const abs_address_t& addr);
+    };
+
+    void append_sheet(std::string name);
+
+    /**
+     * Set a new name to an existing sheet.
+     *
+     * @param sheet 0-based sheet index.
+     * @param name New name of a sheet.
+     */
+    void set_sheet_name(sheet_t sheet, std::string name);
+
+    cell_access get_cell_access(cell_pos pos) const;
+
+    void set_numeric_cell(cell_pos pos, double val);
+
+    void set_string_cell(cell_pos pos, std::string_view s);
+
+    void set_boolean_cell(cell_pos pos, bool val);
+
+    void empty_cell(cell_pos pos);
+
+    double get_numeric_value(cell_pos pos) const;
+
+    std::string_view get_string_value(cell_pos pos) const;
+
+    void set_formula_cell(cell_pos pos, std::string_view formula);
+
+    /**
+     * Calculate all the "dirty" formula cells in the document.
+     *
+     * @param thread_count number of threads to use to perform calculation.
+     *                     When 0 is specified, it only uses the main thread.
+     */
+    void calculate(size_t thread_count);
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */