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diff --git a/doc/codesnippets/doc/src/snippets/persistentindexes/model.cpp b/doc/codesnippets/doc/src/snippets/persistentindexes/model.cpp
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--- a/doc/codesnippets/doc/src/snippets/persistentindexes/model.cpp
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-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial Usage
-** Licensees holding valid Qt Commercial licenses may use this file in
-** accordance with the Qt Commercial License Agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and Nokia.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 2.1 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL included in the
-** packaging of this file.  Please review the following information to
-** ensure the GNU Lesser General Public License version 2.1 requirements
-** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Nokia gives you certain
-** additional rights. These rights are described in the Nokia Qt LGPL
-** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
-** package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3.0 as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL included in the
-** packaging of this file.  Please review the following information to
-** ensure the GNU General Public License version 3.0 requirements will be
-** met: http://www.gnu.org/copyleft/gpl.html.
-**
-** If you are unsure which license is appropriate for your use, please
-** contact the sales department at http://www.qtsoftware.com/contact.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-/*
-  model.cpp
-
-  A simple model that uses a QStringList as its data source.
-*/
-
-#include <qdebug.h>
-
-#include "model.h"
-
-/*!
-    Returns the number of items in the string list as the number of rows
-    in the model.
-*/
-
-int StringListModel::rowCount(const QModelIndex &parent) const
-{
-    return stringList.count();
-}
-
-/*!
-    Returns an appropriate value for the requested data.
-    If the view requests an invalid index, an invalid variant is returned.
-    If a header is requested then we just return the column or row number,
-    depending on the orientation of the header.
-    Any valid index that corresponds to a string in the list causes that
-    string to be returned.
-*/
-
-QVariant StringListModel::data(const QModelIndex &index, int role) const
-{
-    if (!index.isValid())
-        return QVariant();
-
-    if (index.row() < 0 || index.row() >= stringList.size())
-        return QVariant();
-
-    if (role == Qt::DisplayRole)
-        return stringList.at(index.row());
-    else
-        return QVariant();
-}
-
-/*!
-    Returns the appropriate header string depending on the orientation of
-    the header and the section. If anything other than the display role is
-    requested, we return an invalid variant.
-*/
-
-QVariant StringListModel::headerData(int section, Qt::Orientation orientation,
-                                     int role) const
-{
-    if (role != Qt::DisplayRole)
-        return QVariant();
-
-    if (orientation == Qt::Horizontal)
-        return QString("Column %1").arg(section);
-    else
-        return QString("Row %1").arg(section);
-}
-
-/*!
-    Returns an appropriate value for the item's flags. Valid items are
-    enabled, selectable, and editable.
-*/
-
-Qt::ItemFlags StringListModel::flags(const QModelIndex &index) const
-{
-    if (!index.isValid())
-        return Qt::ItemIsEnabled;
-
-    return QAbstractItemModel::flags(index) | Qt::ItemIsEditable;
-}
-
-/*!
-    Changes an item in the string list, but only if the following conditions
-    are met:
-
-    * The index supplied is valid.
-    * The index corresponds to an item to be shown in a view.
-    * The role associated with editing text is specified.
-
-    The dataChanged() signal is emitted if the item is changed.
-*/
-
-bool StringListModel::setData(const QModelIndex &index,
-                              const QVariant &value, int role)
-{
-    if (index.isValid() && role == Qt::EditRole) {
-
-        stringList.replace(index.row(), value.toString());
-        emit dataChanged(index, index);
-        return true;
-    }
-    return false;
-}
-
-/*!
-    Inserts a number of rows into the model at the specified position.
-*/
-
-bool StringListModel::insertRows(int position, int rows, const QModelIndex &parent)
-{
-    beginInsertRows(parent, position, position + rows - 1);
-
-    for (int row = 0; row < rows; ++row) {
-        stringList.insert(position, "");
-    }
-
-    endInsertRows();
-    return true;
-}
-
-/*!
-    Removes a number of rows from the model at the specified position.
-*/
-
-bool StringListModel::removeRows(int position, int rows, const QModelIndex &parent)
-{
-    beginRemoveRows(parent, position, position + rows - 1);
-
-    for (int row = 0; row < rows; ++row) {
-        stringList.removeAt(position);
-    }
-
-    endRemoveRows();
-    return true;
-}