diff --git a/src/xlsx/qtxlsx.pri b/src/xlsx/qtxlsx.pri
index b2d68d9..34ecc22 100755
--- a/src/xlsx/qtxlsx.pri
+++ b/src/xlsx/qtxlsx.pri
@@ -36,7 +36,9 @@ HEADERS += $$PWD/xlsxdocpropscore_p.h \
     $$PWD/xlsxcolor_p.h \
     $$PWD/xlsxnumformatparser_p.h \
     $$PWD/xlsxdrawinganchor_p.h \
-    $$PWD/xlsxmediafile_p.h
+    $$PWD/xlsxmediafile_p.h \
+    $$PWD/xlsxooxmlfile.h \
+    $$PWD/xlsxooxmlfile_p.h
 
 SOURCES += $$PWD/xlsxdocpropscore.cpp \
     $$PWD/xlsxdocpropsapp.cpp \
@@ -61,4 +63,5 @@ SOURCES += $$PWD/xlsxdocpropscore.cpp \
     $$PWD/xlsxcolor.cpp \
     $$PWD/xlsxnumformatparser.cpp \
     $$PWD/xlsxdrawinganchor.cpp \
-    $$PWD/xlsxmediafile.cpp
+    $$PWD/xlsxmediafile.cpp \
+    $$PWD/xlsxooxmlfile.cpp
diff --git a/src/xlsx/xlsxcontenttypes.cpp b/src/xlsx/xlsxcontenttypes.cpp
index 3040d88..e5e16bf 100755
--- a/src/xlsx/xlsxcontenttypes.cpp
+++ b/src/xlsx/xlsxcontenttypes.cpp
@@ -132,15 +132,6 @@ void ContentTypes::clearOverrides()
     m_overrides.clear();
 }
 
-QByteArray ContentTypes::saveToXmlData() const
-{
-    QByteArray data;
-    QBuffer buffer(&data);
-    buffer.open(QIODevice::WriteOnly);
-    saveToXmlFile(&buffer);
-    return data;
-}
-
 void ContentTypes::saveToXmlFile(QIODevice *device) const
 {
     QXmlStreamWriter writer(device);
@@ -205,13 +196,4 @@ bool ContentTypes::loadFromXmlFile(QIODevice *device)
     return true;
 }
 
-bool ContentTypes::loadFromXmlData(const QByteArray &data)
-{
-    QBuffer buffer;
-    buffer.setData(data);
-    buffer.open(QIODevice::ReadOnly);
-
-    return loadFromXmlFile(&buffer);
-}
-
 } //namespace QXlsx
diff --git a/src/xlsx/xlsxcontenttypes_p.h b/src/xlsx/xlsxcontenttypes_p.h
index 4c5aafa..8d99231 100755
--- a/src/xlsx/xlsxcontenttypes_p.h
+++ b/src/xlsx/xlsxcontenttypes_p.h
@@ -36,6 +36,8 @@
 // We mean it.
 //
 
+#include "xlsxooxmlfile.h"
+
 #include <QString>
 #include <QStringList>
 #include <QMap>
@@ -44,7 +46,7 @@ class QIODevice;
 
 namespace QXlsx {
 
-class ContentTypes
+class ContentTypes : public OOXmlFile
 {
 public:
     ContentTypes();
@@ -71,11 +73,8 @@ public:
 
     void clearOverrides();
 
-    QByteArray saveToXmlData() const;
     void saveToXmlFile(QIODevice *device) const;
     bool loadFromXmlFile(QIODevice *device);
-    bool loadFromXmlData(const QByteArray &data);
-
 private:
     QMap<QString, QString> m_defaults;
     QMap<QString, QString> m_overrides;
diff --git a/src/xlsx/xlsxdocpropsapp.cpp b/src/xlsx/xlsxdocpropsapp.cpp
index 36c9ed5..3fb8ec9 100755
--- a/src/xlsx/xlsxdocpropsapp.cpp
+++ b/src/xlsx/xlsxdocpropsapp.cpp
@@ -130,19 +130,8 @@ void DocPropsApp::saveToXmlFile(QIODevice *device) const
     writer.writeEndDocument();
 }
 
-QByteArray DocPropsApp::saveToXmlData() const
+bool DocPropsApp::loadFromXmlFile(QIODevice *device)
 {
-    QByteArray data;
-    QBuffer buffer(&data);
-    buffer.open(QIODevice::WriteOnly);
-    saveToXmlFile(&buffer);
-
-    return data;
-}
-
-DocPropsApp DocPropsApp::loadFromXmlFile(QIODevice *device)
-{
-    DocPropsApp props;
     QXmlStreamReader reader(device);
     while (!reader.atEnd()) {
          QXmlStreamReader::TokenType token = reader.readNext();
@@ -151,9 +140,9 @@ DocPropsApp DocPropsApp::loadFromXmlFile(QIODevice *device)
                  continue;
 
              if (reader.name() == QStringLiteral("Manager")) {
-                 props.setProperty(QStringLiteral("manager"), reader.readElementText());
+                 setProperty(QStringLiteral("manager"), reader.readElementText());
              } else if (reader.name() == QStringLiteral("Company")) {
-                 props.setProperty(QStringLiteral("company"), reader.readElementText());
+                 setProperty(QStringLiteral("company"), reader.readElementText());
              }
          }
 
@@ -161,15 +150,7 @@ DocPropsApp DocPropsApp::loadFromXmlFile(QIODevice *device)
              qDebug("Error when read doc props app file.");
          }
     }
-    return props;
-}
-
-DocPropsApp DocPropsApp::loadFromXmlData(const QByteArray &data)
-{
-    QBuffer buffer;
-    buffer.setData(data);
-    buffer.open(QIODevice::ReadOnly);
-    return loadFromXmlFile(&buffer);
+    return true;
 }
 
 } //namespace
diff --git a/src/xlsx/xlsxdocpropsapp_p.h b/src/xlsx/xlsxdocpropsapp_p.h
index 2324c9a..5471cf8 100755
--- a/src/xlsx/xlsxdocpropsapp_p.h
+++ b/src/xlsx/xlsxdocpropsapp_p.h
@@ -37,6 +37,7 @@
 //
 
 #include "xlsxglobal.h"
+#include "xlsxooxmlfile.h"
 #include <QList>
 #include <QPair>
 #include <QStringList>
@@ -46,7 +47,7 @@ class QIODevice;
 
 namespace QXlsx {
 
-class XLSX_AUTOTEST_EXPORT DocPropsApp
+class XLSX_AUTOTEST_EXPORT DocPropsApp : public OOXmlFile
 {
 public:
     DocPropsApp();
@@ -58,10 +59,8 @@ public:
     QString property(const QString &name) const;
     QStringList propertyNames() const;
 
-    QByteArray saveToXmlData() const;
     void saveToXmlFile(QIODevice *device) const;
-    static DocPropsApp loadFromXmlFile(QIODevice *device);
-    static DocPropsApp loadFromXmlData(const QByteArray &data);
+    bool loadFromXmlFile(QIODevice *device);
 
 private:
     QStringList m_titlesOfPartsList;
diff --git a/src/xlsx/xlsxdocpropscore.cpp b/src/xlsx/xlsxdocpropscore.cpp
index 2bde22f..459d342 100644
--- a/src/xlsx/xlsxdocpropscore.cpp
+++ b/src/xlsx/xlsxdocpropscore.cpp
@@ -124,19 +124,8 @@ void DocPropsCore::saveToXmlFile(QIODevice *device) const
     writer.writeEndDocument();
 }
 
-QByteArray DocPropsCore::saveToXmlData() const
+bool DocPropsCore::loadFromXmlFile(QIODevice *device)
 {
-    QByteArray data;
-    QBuffer buffer(&data);
-    buffer.open(QIODevice::WriteOnly);
-    saveToXmlFile(&buffer);
-
-    return data;
-}
-
-DocPropsCore DocPropsCore::loadFromXmlFile(QIODevice *device)
-{
-    DocPropsCore props;
     QXmlStreamReader reader(device);
 
     const QString cp = QStringLiteral("http://schemas.openxmlformats.org/package/2006/metadata/core-properties");
@@ -149,21 +138,21 @@ DocPropsCore DocPropsCore::loadFromXmlFile(QIODevice *device)
              const QStringRef nsUri = reader.namespaceUri();
              const QStringRef name = reader.name();
              if (name == QStringLiteral("subject") && nsUri == dc) {
-                 props.setProperty(QStringLiteral("subject"), reader.readElementText());
+                 setProperty(QStringLiteral("subject"), reader.readElementText());
              } else if (name == QStringLiteral("title") && nsUri == dc) {
-                 props.setProperty(QStringLiteral("title"), reader.readElementText());
+                 setProperty(QStringLiteral("title"), reader.readElementText());
              } else if (name == QStringLiteral("creator") && nsUri == dc) {
-                 props.setProperty(QStringLiteral("creator"), reader.readElementText());
+                 setProperty(QStringLiteral("creator"), reader.readElementText());
              } else if (name == QStringLiteral("description") && nsUri == dc) {
-                 props.setProperty(QStringLiteral("description"), reader.readElementText());
+                 setProperty(QStringLiteral("description"), reader.readElementText());
              } else if (name == QStringLiteral("keywords") && nsUri == cp) {
-                 props.setProperty(QStringLiteral("keywords"), reader.readElementText());
+                 setProperty(QStringLiteral("keywords"), reader.readElementText());
              } else if (name == QStringLiteral("created") && nsUri == dcterms) {
-                 props.setProperty(QStringLiteral("created"), reader.readElementText());
+                 setProperty(QStringLiteral("created"), reader.readElementText());
              } else if (name == QStringLiteral("category") && nsUri == cp) {
-                 props.setProperty(QStringLiteral("category"), reader.readElementText());
+                 setProperty(QStringLiteral("category"), reader.readElementText());
              } else if (name == QStringLiteral("contentStatus") && nsUri == cp) {
-                 props.setProperty(QStringLiteral("status"), reader.readElementText());
+                 setProperty(QStringLiteral("status"), reader.readElementText());
              }
          }
 
@@ -172,16 +161,7 @@ DocPropsCore DocPropsCore::loadFromXmlFile(QIODevice *device)
 
          }
     }
-    return props;
-}
-
-DocPropsCore DocPropsCore::loadFromXmlData(const QByteArray &data)
-{
-    QBuffer buffer;
-    buffer.setData(data);
-    buffer.open(QIODevice::ReadOnly);
-    return loadFromXmlFile(&buffer);
+    return true;
 }
 
-
 } //namespace
diff --git a/src/xlsx/xlsxdocpropscore_p.h b/src/xlsx/xlsxdocpropscore_p.h
index 6a8e717..a399ca7 100644
--- a/src/xlsx/xlsxdocpropscore_p.h
+++ b/src/xlsx/xlsxdocpropscore_p.h
@@ -37,6 +37,7 @@
 //
 
 #include "xlsxglobal.h"
+#include "xlsxooxmlfile.h"
 #include <QMap>
 #include <QStringList>
 
@@ -44,7 +45,7 @@ class QIODevice;
 
 namespace QXlsx {
 
-class XLSX_AUTOTEST_EXPORT DocPropsCore
+class XLSX_AUTOTEST_EXPORT DocPropsCore : public OOXmlFile
 {
 public:
     explicit DocPropsCore();
@@ -54,9 +55,7 @@ public:
     QStringList propertyNames() const;
         
     void saveToXmlFile(QIODevice *device) const;
-    QByteArray saveToXmlData() const;
-    static DocPropsCore loadFromXmlFile(QIODevice *device);
-    static DocPropsCore loadFromXmlData(const QByteArray &data);
+    bool loadFromXmlFile(QIODevice *device);
 
 private:
     QMap<QString, QString> m_properties;
diff --git a/src/xlsx/xlsxdocument.cpp b/src/xlsx/xlsxdocument.cpp
index 3127801..4b19cd1 100644
--- a/src/xlsx/xlsxdocument.cpp
+++ b/src/xlsx/xlsxdocument.cpp
@@ -119,7 +119,8 @@ bool DocumentPrivate::loadPackage(QIODevice *device)
         //In normal case, this should be "docProps/core.xml"
         QString docPropsCore_Name = rels_core[0].target;
 
-        DocPropsCore props = DocPropsCore::loadFromXmlData(zipReader.fileData(docPropsCore_Name));
+        DocPropsCore props;
+        props.loadFromXmlData(zipReader.fileData(docPropsCore_Name));
         foreach (QString name, props.propertyNames())
             q->setDocumentProperty(name, props.property(name));
     }
@@ -131,7 +132,8 @@ bool DocumentPrivate::loadPackage(QIODevice *device)
         //In normal case, this should be "docProps/app.xml"
         QString docPropsApp_Name = rels_app[0].target;
 
-        DocPropsApp props = DocPropsApp::loadFromXmlData(zipReader.fileData(docPropsApp_Name));
+        DocPropsApp props;
+        props.loadFromXmlData(zipReader.fileData(docPropsApp_Name));
         foreach (QString name, props.propertyNames())
             q->setDocumentProperty(name, props.property(name));
     }
@@ -146,7 +148,6 @@ bool DocumentPrivate::loadPackage(QIODevice *device)
     QString xlworkbook_Dir = xlworkbook_PathList[0];
     workbook->relationships().loadFromXmlData(zipReader.fileData(getRelFilePath(xlworkbook_Path)));
     workbook->loadFromXmlData(zipReader.fileData(xlworkbook_Path));
-    QList<XlsxSheetItemInfo> sheetNameIdPairList = workbook->d_func()->sheetItemInfoList;
 
     //load styles
     QList<XlsxRelationship> rels_styles = workbook->relationships().documentRelationships(QStringLiteral("/styles"));
@@ -156,7 +157,7 @@ bool DocumentPrivate::loadPackage(QIODevice *device)
         QString path = xlworkbook_Dir + QLatin1String("/") + name;
         QSharedPointer<Styles> styles (new Styles(true));
         styles->loadFromXmlData(zipReader.fileData(path));
-        workbook->d_ptr->styles = styles;
+        workbook->d_func()->styles = styles;
     }
 
     //load sharedStrings
@@ -165,7 +166,7 @@ bool DocumentPrivate::loadPackage(QIODevice *device)
         //In normal case this should be sharedStrings.xml which in xl
         QString name = rels_sharedStrings[0].target;
         QString path = xlworkbook_Dir + QLatin1String("/") + name;
-        workbook->d_ptr->sharedStrings->loadFromXmlData(zipReader.fileData(path));
+        workbook->d_func()->sharedStrings->loadFromXmlData(zipReader.fileData(path));
     }
 
     //load theme
@@ -182,6 +183,8 @@ bool DocumentPrivate::loadPackage(QIODevice *device)
     if (rels_worksheets.isEmpty())
         return false;
 
+    QList<XlsxSheetItemInfo> sheetNameIdPairList = workbook->d_func()->sheetItemInfoList;
+
     for (int i=0; i<sheetNameIdPairList.size(); ++i) {
         XlsxSheetItemInfo info = sheetNameIdPairList[i];
         QString worksheet_path = xlworkbook_Dir + QLatin1String("/") + workbook->relationships().getRelationshipById(info.rId).target;
diff --git a/src/xlsx/xlsxdrawing.cpp b/src/xlsx/xlsxdrawing.cpp
index 2ff2633..644930d 100644
--- a/src/xlsx/xlsxdrawing.cpp
+++ b/src/xlsx/xlsxdrawing.cpp
@@ -43,15 +43,6 @@ Drawing::~Drawing()
     qDeleteAll(anchors);
 }
 
-QByteArray Drawing::saveToXmlData() const
-{
-    QByteArray data;
-    QBuffer buffer(&data);
-    buffer.open(QIODevice::WriteOnly);
-    saveToXmlFile(&buffer);
-    return data;
-}
-
 void Drawing::saveToXmlFile(QIODevice *device) const
 {
     relationships.clear();
@@ -92,13 +83,4 @@ bool Drawing::loadFromXmlFile(QIODevice *device)
     return true;
 }
 
-bool Drawing::loadFromXmlData(const QByteArray &data)
-{
-    QBuffer buffer;
-    buffer.setData(data);
-    buffer.open(QIODevice::ReadOnly);
-
-    return loadFromXmlFile(&buffer);
-}
-
 } // namespace QXlsx
diff --git a/src/xlsx/xlsxdrawing_p.h b/src/xlsx/xlsxdrawing_p.h
index dba29a5..b53acd4 100644
--- a/src/xlsx/xlsxdrawing_p.h
+++ b/src/xlsx/xlsxdrawing_p.h
@@ -38,6 +38,7 @@
 //
 
 #include "xlsxrelationships_p.h"
+#include "xlsxooxmlfile.h"
 
 #include <QList>
 #include <QString>
@@ -52,15 +53,13 @@ class DrawingAnchor;
 class Workbook;
 class MediaFile;
 
-class Drawing
+class Drawing : public OOXmlFile
 {
 public:
     Drawing(Workbook *workbook);
     ~Drawing();
     void saveToXmlFile(QIODevice *device) const;
-    QByteArray saveToXmlData() const;
     bool loadFromXmlFile(QIODevice *device);
-    bool loadFromXmlData(const QByteArray &data);
 
     Workbook *workbook;
     QList<DrawingAnchor *> anchors;
diff --git a/src/xlsx/xlsxooxmlfile.cpp b/src/xlsx/xlsxooxmlfile.cpp
new file mode 100644
index 0000000..334f4a9
--- /dev/null
+++ b/src/xlsx/xlsxooxmlfile.cpp
@@ -0,0 +1,83 @@
+/****************************************************************************
+** Copyright (c) 2013-2014 Debao Zhang <hello@debao.me>
+** All right reserved.
+**
+** Permission is hereby granted, free of charge, to any person obtaining
+** a copy of this software and associated documentation files (the
+** "Software"), to deal in the Software without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Software, and to
+** permit persons to whom the Software is furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be
+** included in all copies or substantial portions of the Software.
+**
+** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+** NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+** LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+** OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+** WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+**
+****************************************************************************/
+
+#include "xlsxooxmlfile.h"
+#include "xlsxooxmlfile_p.h"
+
+#include <QBuffer>
+#include <QByteArray>
+
+QT_BEGIN_NAMESPACE_XLSX
+
+OOXmlFilePrivate::OOXmlFilePrivate(OOXmlFile *q)
+    :q_ptr(q)
+{
+
+}
+
+/*!
+ * \internal
+ *
+ * \class OOXmlFile
+ *
+ * Base class of all the ooxml part file.
+ */
+
+OOXmlFile::OOXmlFile()
+    :d_ptr(new OOXmlFilePrivate(this))
+{
+}
+
+OOXmlFile::OOXmlFile(OOXmlFilePrivate *d)
+    :d_ptr(d)
+{
+
+}
+
+OOXmlFile::~OOXmlFile()
+{
+    delete d_ptr;
+}
+
+QByteArray OOXmlFile::saveToXmlData() const
+{
+    QByteArray data;
+    QBuffer buffer(&data);
+    buffer.open(QIODevice::WriteOnly);
+    saveToXmlFile(&buffer);
+
+    return data;
+}
+
+bool OOXmlFile::loadFromXmlData(const QByteArray &data)
+{
+    QBuffer buffer;
+    buffer.setData(data);
+    buffer.open(QIODevice::ReadOnly);
+
+    return loadFromXmlFile(&buffer);
+}
+
+QT_END_NAMESPACE_XLSX
diff --git a/src/xlsx/xlsxooxmlfile.h b/src/xlsx/xlsxooxmlfile.h
new file mode 100644
index 0000000..fbcb677
--- /dev/null
+++ b/src/xlsx/xlsxooxmlfile.h
@@ -0,0 +1,58 @@
+/****************************************************************************
+** Copyright (c) 2013-2014 Debao Zhang <hello@debao.me>
+** All right reserved.
+**
+** Permission is hereby granted, free of charge, to any person obtaining
+** a copy of this software and associated documentation files (the
+** "Software"), to deal in the Software without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Software, and to
+** permit persons to whom the Software is furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be
+** included in all copies or substantial portions of the Software.
+**
+** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+** NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+** LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+** OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+** WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+**
+****************************************************************************/
+
+#ifndef QXLSX_XLSXOOXMLFILE_H
+#define QXLSX_XLSXOOXMLFILE_H
+
+#include "xlsxglobal.h"
+
+class QIODevice;
+class QByteArray;
+
+QT_BEGIN_NAMESPACE_XLSX
+
+class OOXmlFilePrivate;
+
+class Q_XLSX_EXPORT OOXmlFile
+{
+public:
+    virtual ~OOXmlFile();
+
+    virtual void saveToXmlFile(QIODevice *device) const = 0;
+    virtual bool loadFromXmlFile(QIODevice *device) = 0;
+
+    virtual QByteArray saveToXmlData() const;
+    virtual bool loadFromXmlData(const QByteArray &data);
+
+protected:
+    OOXmlFile();
+    OOXmlFile(OOXmlFilePrivate *d);
+
+    OOXmlFilePrivate *d_ptr;
+};
+
+QT_END_NAMESPACE_XLSX
+
+#endif // QXLSX_XLSXOOXMLFILE_H
diff --git a/src/xlsx/xlsxooxmlfile_p.h b/src/xlsx/xlsxooxmlfile_p.h
new file mode 100644
index 0000000..e79b4c5
--- /dev/null
+++ b/src/xlsx/xlsxooxmlfile_p.h
@@ -0,0 +1,56 @@
+/****************************************************************************
+** Copyright (c) 2013-2014 Debao Zhang <hello@debao.me>
+** All right reserved.
+**
+** Permission is hereby granted, free of charge, to any person obtaining
+** a copy of this software and associated documentation files (the
+** "Software"), to deal in the Software without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Software, and to
+** permit persons to whom the Software is furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be
+** included in all copies or substantial portions of the Software.
+**
+** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+** NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+** LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+** OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+** WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+**
+****************************************************************************/
+
+#ifndef XLSXOOXMLFILE_P_H
+#define XLSXOOXMLFILE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "xlsxooxmlfile.h"
+
+QT_BEGIN_NAMESPACE_XLSX
+
+class XLSX_AUTOTEST_EXPORT OOXmlFilePrivate
+{
+    Q_DECLARE_PUBLIC(OOXmlFile)
+
+public:
+    OOXmlFilePrivate(OOXmlFile *q);
+
+    OOXmlFile *q_ptr;
+};
+
+QT_END_NAMESPACE_XLSX
+
+#endif // XLSXOOXMLFILE_P_H
diff --git a/src/xlsx/xlsxsharedstrings.cpp b/src/xlsx/xlsxsharedstrings.cpp
index 9cbfe25..302a1eb 100755
--- a/src/xlsx/xlsxsharedstrings.cpp
+++ b/src/xlsx/xlsxsharedstrings.cpp
@@ -242,16 +242,6 @@ void SharedStrings::saveToXmlFile(QIODevice *device) const
     writer.writeEndDocument();
 }
 
-QByteArray SharedStrings::saveToXmlData() const
-{
-    QByteArray data;
-    QBuffer buffer(&data);
-    buffer.open(QIODevice::WriteOnly);
-    saveToXmlFile(&buffer);
-
-    return data;
-}
-
 void SharedStrings::readString(QXmlStreamReader &reader)
 {
     Q_ASSERT(reader.name() == QLatin1String("si"));
@@ -384,13 +374,4 @@ bool SharedStrings::loadFromXmlFile(QIODevice *device)
     return true;
 }
 
-bool SharedStrings::loadFromXmlData(const QByteArray &data)
-{
-    QBuffer buffer;
-    buffer.setData(data);
-    buffer.open(QIODevice::ReadOnly);
-
-    return loadFromXmlFile(&buffer);
-}
-
 } //namespace
diff --git a/src/xlsx/xlsxsharedstrings_p.h b/src/xlsx/xlsxsharedstrings_p.h
index 65e56ee..f792ef6 100755
--- a/src/xlsx/xlsxsharedstrings_p.h
+++ b/src/xlsx/xlsxsharedstrings_p.h
@@ -38,6 +38,7 @@
 
 #include "xlsxglobal.h"
 #include "xlsxrichstring.h"
+#include "xlsxooxmlfile.h"
 #include <QHash>
 #include <QStringList>
 #include <QSharedPointer>
@@ -60,7 +61,7 @@ public:
     int count;
 };
 
-class XLSX_AUTOTEST_EXPORT SharedStrings
+class XLSX_AUTOTEST_EXPORT SharedStrings : public OOXmlFile
 {
 public:
     SharedStrings();
@@ -79,9 +80,7 @@ public:
     QList<RichString> getSharedStrings() const;
 
     void saveToXmlFile(QIODevice *device) const;
-    QByteArray saveToXmlData() const;
     bool loadFromXmlFile(QIODevice *device);
-    bool loadFromXmlData(const QByteArray &data);
 
 private:
     void readString(QXmlStreamReader &reader); // <si>
diff --git a/src/xlsx/xlsxstyles.cpp b/src/xlsx/xlsxstyles.cpp
index ac37565..afa031e 100755
--- a/src/xlsx/xlsxstyles.cpp
+++ b/src/xlsx/xlsxstyles.cpp
@@ -265,17 +265,7 @@ void Styles::addDxfFormat(const Format &format, bool force)
     }
 }
 
-QByteArray Styles::saveToXmlData()
-{
-    QByteArray data;
-    QBuffer buffer(&data);
-    buffer.open(QIODevice::WriteOnly);
-    saveToXmlFile(&buffer);
-
-    return data;
-}
-
-void Styles::saveToXmlFile(QIODevice *device)
+void Styles::saveToXmlFile(QIODevice *device) const
 {
     QXmlStreamWriter writer(device);
 
@@ -321,7 +311,7 @@ void Styles::saveToXmlFile(QIODevice *device)
     writer.writeEndDocument();
 }
 
-void Styles::writeNumFmts(QXmlStreamWriter &writer)
+void Styles::writeNumFmts(QXmlStreamWriter &writer) const
 {
     if (m_customNumFmtIdMap.size() == 0)
         return;
@@ -341,7 +331,7 @@ void Styles::writeNumFmts(QXmlStreamWriter &writer)
 
 /*
 */
-void Styles::writeFonts(QXmlStreamWriter &writer)
+void Styles::writeFonts(QXmlStreamWriter &writer) const
 {
     writer.writeStartElement(QStringLiteral("fonts"));
     writer.writeAttribute(QStringLiteral("count"), QString::number(m_fontsList.count()));
@@ -350,7 +340,7 @@ void Styles::writeFonts(QXmlStreamWriter &writer)
     writer.writeEndElement();//fonts
 }
 
-void Styles::writeFont(QXmlStreamWriter &writer, const Format &format, bool isDxf)
+void Styles::writeFont(QXmlStreamWriter &writer, const Format &format, bool isDxf) const
 {
     writer.writeStartElement(QStringLiteral("font"));
 
@@ -431,7 +421,7 @@ void Styles::writeFont(QXmlStreamWriter &writer, const Format &format, bool isDx
     writer.writeEndElement(); //font
 }
 
-void Styles::writeFills(QXmlStreamWriter &writer)
+void Styles::writeFills(QXmlStreamWriter &writer) const
 {
     writer.writeStartElement(QStringLiteral("fills"));
     writer.writeAttribute(QStringLiteral("count"), QString::number(m_fillsList.size()));
@@ -442,7 +432,7 @@ void Styles::writeFills(QXmlStreamWriter &writer)
     writer.writeEndElement(); //fills
 }
 
-void Styles::writeFill(QXmlStreamWriter &writer, const Format &fill, bool isDxf)
+void Styles::writeFill(QXmlStreamWriter &writer, const Format &fill, bool isDxf) const
 {
     static QMap<int, QString> patternStrings;
     if (patternStrings.isEmpty()) {
@@ -491,7 +481,7 @@ void Styles::writeFill(QXmlStreamWriter &writer, const Format &fill, bool isDxf)
     writer.writeEndElement();//fill
 }
 
-void Styles::writeBorders(QXmlStreamWriter &writer)
+void Styles::writeBorders(QXmlStreamWriter &writer) const
 {
     writer.writeStartElement(QStringLiteral("borders"));
     writer.writeAttribute(QStringLiteral("count"), QString::number(m_bordersList.count()));
@@ -500,7 +490,7 @@ void Styles::writeBorders(QXmlStreamWriter &writer)
     writer.writeEndElement();//borders
 }
 
-void Styles::writeBorder(QXmlStreamWriter &writer, const Format &border, bool isDxf)
+void Styles::writeBorder(QXmlStreamWriter &writer, const Format &border, bool isDxf) const
 {
     writer.writeStartElement(QStringLiteral("border"));
     if (border.hasProperty(FormatPrivate::P_Border_DiagonalType)) {
@@ -532,7 +522,7 @@ void Styles::writeBorder(QXmlStreamWriter &writer, const Format &border, bool is
     writer.writeEndElement();//border
 }
 
-void Styles::writeSubBorder(QXmlStreamWriter &writer, const QString &type, int style, const XlsxColor &color)
+void Styles::writeSubBorder(QXmlStreamWriter &writer, const QString &type, int style, const XlsxColor &color) const
 {
     if (style == Format::BorderNone) {
         writer.writeEmptyElement(type);
@@ -564,7 +554,7 @@ void Styles::writeSubBorder(QXmlStreamWriter &writer, const QString &type, int s
     writer.writeEndElement();//type
 }
 
-void Styles::writeCellXfs(QXmlStreamWriter &writer)
+void Styles::writeCellXfs(QXmlStreamWriter &writer) const
 {
     writer.writeStartElement(QStringLiteral("cellXfs"));
     writer.writeAttribute(QStringLiteral("count"), QString::number(m_xf_formatsList.size()));
@@ -650,7 +640,7 @@ void Styles::writeCellXfs(QXmlStreamWriter &writer)
     writer.writeEndElement();//cellXfs
 }
 
-void Styles::writeDxfs(QXmlStreamWriter &writer)
+void Styles::writeDxfs(QXmlStreamWriter &writer) const
 {
     writer.writeStartElement(QStringLiteral("dxfs"));
     writer.writeAttribute(QStringLiteral("count"), QString::number(m_dxf_formatsList.size()));
@@ -659,7 +649,7 @@ void Styles::writeDxfs(QXmlStreamWriter &writer)
     writer.writeEndElement(); //dxfs
 }
 
-void Styles::writeDxf(QXmlStreamWriter &writer, const Format &format)
+void Styles::writeDxf(QXmlStreamWriter &writer, const Format &format) const
 {
     writer.writeStartElement(QStringLiteral("dxf"));
 
@@ -1259,15 +1249,6 @@ bool Styles::loadFromXmlFile(QIODevice *device)
     return true;
 }
 
-bool Styles::loadFromXmlData(const QByteArray &data)
-{
-    QBuffer buffer;
-    buffer.setData(data);
-    buffer.open(QIODevice::ReadOnly);
-
-    return loadFromXmlFile(&buffer);
-}
-
 QColor Styles::getColorByIndex(int idx)
 {
     if (m_indexedColors.isEmpty()) {
diff --git a/src/xlsx/xlsxstyles_p.h b/src/xlsx/xlsxstyles_p.h
index 6a4d1de..07a9a15 100755
--- a/src/xlsx/xlsxstyles_p.h
+++ b/src/xlsx/xlsxstyles_p.h
@@ -38,6 +38,7 @@
 
 #include "xlsxglobal.h"
 #include "xlsxformat.h"
+#include "xlsxooxmlfile.h"
 #include <QSharedPointer>
 #include <QHash>
 #include <QList>
@@ -63,7 +64,7 @@ struct XlsxFormatNumberData
     QString formatString;
 };
 
-class XLSX_AUTOTEST_EXPORT Styles
+class XLSX_AUTOTEST_EXPORT Styles : public OOXmlFile
 {
 public:
     Styles(bool createEmpty=false);
@@ -73,10 +74,8 @@ public:
     void addDxfFormat(const Format &format, bool force=false);
     Format dxfFormat(int idx) const;
 
-    QByteArray saveToXmlData();
-    void saveToXmlFile(QIODevice *device);
+    void saveToXmlFile(QIODevice *device) const;
     bool loadFromXmlFile(QIODevice *device);
-    bool loadFromXmlData(const QByteArray &data);
 
     QColor getColorByIndex(int idx);
 
@@ -86,17 +85,17 @@ private:
 
     void fixNumFmt(const Format &format);
 
-    void writeNumFmts(QXmlStreamWriter &writer);
-    void writeFonts(QXmlStreamWriter &writer);
-    void writeFont(QXmlStreamWriter &writer, const Format &font, bool isDxf = false);
-    void writeFills(QXmlStreamWriter &writer);
-    void writeFill(QXmlStreamWriter &writer, const Format &fill, bool isDxf = false);
-    void writeBorders(QXmlStreamWriter &writer);
-    void writeBorder(QXmlStreamWriter &writer, const Format &border, bool isDxf = false);
-    void writeSubBorder(QXmlStreamWriter &writer, const QString &type, int style, const XlsxColor &color);
-    void writeCellXfs(QXmlStreamWriter &writer);
-    void writeDxfs(QXmlStreamWriter &writer);
-    void writeDxf(QXmlStreamWriter &writer, const Format &format);
+    void writeNumFmts(QXmlStreamWriter &writer) const;
+    void writeFonts(QXmlStreamWriter &writer) const;
+    void writeFont(QXmlStreamWriter &writer, const Format &font, bool isDxf = false) const;
+    void writeFills(QXmlStreamWriter &writer) const;
+    void writeFill(QXmlStreamWriter &writer, const Format &fill, bool isDxf = false) const;
+    void writeBorders(QXmlStreamWriter &writer) const;
+    void writeBorder(QXmlStreamWriter &writer, const Format &border, bool isDxf = false) const;
+    void writeSubBorder(QXmlStreamWriter &writer, const QString &type, int style, const XlsxColor &color) const;
+    void writeCellXfs(QXmlStreamWriter &writer) const;
+    void writeDxfs(QXmlStreamWriter &writer) const;
+    void writeDxf(QXmlStreamWriter &writer, const Format &format) const;
 
     bool readNumFmts(QXmlStreamReader &reader);
     bool readFonts(QXmlStreamReader &reader);
diff --git a/src/xlsx/xlsxtheme.cpp b/src/xlsx/xlsxtheme.cpp
index ee9a832..80de6de 100755
--- a/src/xlsx/xlsxtheme.cpp
+++ b/src/xlsx/xlsxtheme.cpp
@@ -221,9 +221,16 @@ QByteArray Theme::saveToXmlData() const
         return xmlData;
 }
 
-void Theme::loadFromXmlData(const QByteArray &data)
+bool Theme::loadFromXmlData(const QByteArray &data)
 {
     xmlData = data;
+    return true;
+}
+
+bool Theme::loadFromXmlFile(QIODevice *device)
+{
+    xmlData = device->readAll();
+    return true;
 }
 
 }
diff --git a/src/xlsx/xlsxtheme_p.h b/src/xlsx/xlsxtheme_p.h
index 312c78e..746c058 100755
--- a/src/xlsx/xlsxtheme_p.h
+++ b/src/xlsx/xlsxtheme_p.h
@@ -35,20 +35,22 @@
 //
 // We mean it.
 //
+#include "xlsxooxmlfile.h"
 
 #include <QString>
 class QIODevice;
 
 namespace QXlsx {
 
-class Theme
+class Theme : public OOXmlFile
 {
 public:
     Theme();
 
     void saveToXmlFile(QIODevice *device) const;
     QByteArray saveToXmlData() const;
-    void loadFromXmlData(const QByteArray &data);
+    bool loadFromXmlData(const QByteArray &data);
+    bool loadFromXmlFile(QIODevice *device);
 
     QByteArray xmlData;
 };
diff --git a/src/xlsx/xlsxworkbook.cpp b/src/xlsx/xlsxworkbook.cpp
index 144744e..6db0af3 100755
--- a/src/xlsx/xlsxworkbook.cpp
+++ b/src/xlsx/xlsxworkbook.cpp
@@ -40,7 +40,7 @@
 QT_BEGIN_NAMESPACE_XLSX
 
 WorkbookPrivate::WorkbookPrivate(Workbook *q) :
-    q_ptr(q)
+    OOXmlFilePrivate(q)
 {
     sharedStrings = QSharedPointer<SharedStrings> (new SharedStrings);
     styles = QSharedPointer<Styles>(new Styles);
@@ -63,15 +63,14 @@ WorkbookPrivate::WorkbookPrivate(Workbook *q) :
     last_sheet_id = 0;
 }
 
-Workbook::Workbook() :
-    d_ptr(new WorkbookPrivate(this))
+Workbook::Workbook()
+    : OOXmlFile(new WorkbookPrivate(this))
 {
 
 }
 
 Workbook::~Workbook()
 {
-    delete d_ptr;
 }
 
 bool Workbook::isDate1904() const
@@ -477,16 +476,6 @@ void Workbook::saveToXmlFile(QIODevice *device) const
     writer.writeEndDocument();
 }
 
-QByteArray Workbook::saveToXmlData() const
-{
-    QByteArray data;
-    QBuffer buffer(&data);
-    buffer.open(QIODevice::WriteOnly);
-    saveToXmlFile(&buffer);
-
-    return data;
-}
-
 bool Workbook::loadFromXmlFile(QIODevice *device)
 {
     Q_D(Workbook);
@@ -549,15 +538,6 @@ bool Workbook::loadFromXmlFile(QIODevice *device)
     return true;
 }
 
-bool Workbook::loadFromXmlData(const QByteArray &data)
-{
-    QBuffer buffer;
-    buffer.setData(data);
-    buffer.open(QIODevice::ReadOnly);
-
-    return loadFromXmlFile(&buffer);
-}
-
 /*!
  * \internal
  */
diff --git a/src/xlsx/xlsxworkbook.h b/src/xlsx/xlsxworkbook.h
index 9b24ab1..ebdc1ac 100755
--- a/src/xlsx/xlsxworkbook.h
+++ b/src/xlsx/xlsxworkbook.h
@@ -26,6 +26,7 @@
 #define XLSXWORKBOOK_H
 
 #include "xlsxglobal.h"
+#include "xlsxooxmlfile.h"
 #include <QList>
 #include <QImage>
 #include <QSharedPointer>
@@ -45,7 +46,7 @@ class DocumentPrivate;
 class MediaFile;
 
 class WorkbookPrivate;
-class Q_XLSX_EXPORT Workbook
+class Q_XLSX_EXPORT Workbook : public OOXmlFile
 {
     Q_DECLARE_PRIVATE(Workbook)
 public:
@@ -89,9 +90,7 @@ private:
     Workbook();
 
     void saveToXmlFile(QIODevice *device) const;
-    QByteArray saveToXmlData() const;
     bool loadFromXmlFile(QIODevice *device);
-    bool loadFromXmlData(const QByteArray &data);
     Relationships &relationships();
 
     SharedStrings *sharedStrings() const;
@@ -101,8 +100,6 @@ private:
     QList<Drawing *> drawings();
     QStringList worksheetNames() const;
     Worksheet *addWorksheet(const QString &name, int sheetId);
-
-    WorkbookPrivate * const d_ptr;
 };
 
 QT_END_NAMESPACE_XLSX
diff --git a/src/xlsx/xlsxworkbook_p.h b/src/xlsx/xlsxworkbook_p.h
index 682a7ad..ccd67e8 100644
--- a/src/xlsx/xlsxworkbook_p.h
+++ b/src/xlsx/xlsxworkbook_p.h
@@ -37,6 +37,7 @@
 //
 
 #include "xlsxworkbook.h"
+#include "xlsxooxmlfile_p.h"
 #include "xlsxtheme_p.h"
 #include "xlsxrelationships_p.h"
 
@@ -73,13 +74,12 @@ struct XlsxDefineNameData
     int sheetId;
 };
 
-class WorkbookPrivate
+class WorkbookPrivate : public OOXmlFilePrivate
 {
     Q_DECLARE_PUBLIC(Workbook)
 public:
     WorkbookPrivate(Workbook *q);
 
-    Workbook *q_ptr;
     mutable Relationships relationships;
 
     QSharedPointer<SharedStrings> sharedStrings;
diff --git a/src/xlsx/xlsxworksheet.cpp b/src/xlsx/xlsxworksheet.cpp
index f4a693d..0ed1df9 100755
--- a/src/xlsx/xlsxworksheet.cpp
+++ b/src/xlsx/xlsxworksheet.cpp
@@ -54,8 +54,8 @@
 
 QT_BEGIN_NAMESPACE_XLSX
 
-WorksheetPrivate::WorksheetPrivate(Worksheet *p) :
-    q_ptr(p)
+WorksheetPrivate::WorksheetPrivate(Worksheet *p)
+    : OOXmlFilePrivate(p)
   , windowProtection(false), showFormulas(false), showGridLines(true), showRowColHeaders(true)
   , showZeros(true), rightToLeft(false), tabSelected(false), showRuler(false)
   , showOutlineSymbols(true), showWhiteSpace(true)
@@ -174,13 +174,13 @@ int WorksheetPrivate::checkDimensions(int row, int col, bool ignore_row, bool ig
  *             (Note: id is not the index of the sheet in workbook)
  */
 Worksheet::Worksheet(const QString &name, int id, Workbook *workbook) :
-    d_ptr(new WorksheetPrivate(this))
+    OOXmlFile(new WorksheetPrivate(this))
 {
-    d_ptr->name = name;
-    d_ptr->id = id;
+    d_func()->name = name;
+    d_func()->id = id;
     if (!workbook) //For unit test propose only. Ignore the memery leak.
         workbook = new Workbook;
-    d_ptr->workbook = workbook;
+    d_func()->workbook = workbook;
 }
 
 QSharedPointer<Worksheet> Worksheet::copy(const QString &distName, int distId) const
@@ -188,7 +188,7 @@ QSharedPointer<Worksheet> Worksheet::copy(const QString &distName, int distId) c
     Q_D(const Worksheet);
     QSharedPointer<Worksheet> sheet(new Worksheet(distName, distId, d->workbook));
 
-    WorksheetPrivate *sheet_d = sheet->d_ptr;
+    WorksheetPrivate *sheet_d = sheet->d_func();
 
     sheet_d->dimension = d->dimension;
 
@@ -223,7 +223,6 @@ QSharedPointer<Worksheet> Worksheet::copy(const QString &distName, int distId) c
 
 Worksheet::~Worksheet()
 {
-    delete d_ptr;
 }
 
 bool Worksheet::isChartsheet() const
@@ -1767,16 +1766,6 @@ int WorksheetPrivate::colPixelsSize(int col) const
     return pixels;
 }
 
-QByteArray Worksheet::saveToXmlData() const
-{
-    QByteArray data;
-    QBuffer buffer(&data);
-    buffer.open(QIODevice::WriteOnly);
-    saveToXmlFile(&buffer);
-
-    return data;
-}
-
 QSharedPointer<Cell> WorksheetPrivate::loadXmlNumericCellData(QXmlStreamReader &reader)
 {
     Q_ASSERT(reader.name() == QLatin1String("c"));
@@ -2133,15 +2122,6 @@ bool Worksheet::loadFromXmlFile(QIODevice *device)
     return true;
 }
 
-bool Worksheet::loadFromXmlData(const QByteArray &data)
-{
-    QBuffer buffer;
-    buffer.setData(data);
-    buffer.open(QIODevice::ReadOnly);
-
-    return loadFromXmlFile(&buffer);
-}
-
 /*!
  * \internal
  *  Unit test can use this member to get sharedString object.
diff --git a/src/xlsx/xlsxworksheet.h b/src/xlsx/xlsxworksheet.h
index 301d111..92f130d 100755
--- a/src/xlsx/xlsxworksheet.h
+++ b/src/xlsx/xlsxworksheet.h
@@ -28,6 +28,7 @@
 #include "xlsxglobal.h"
 #include "xlsxcell.h"
 #include "xlsxcellrange.h"
+#include "xlsxooxmlfile.h"
 #include <QStringList>
 #include <QMap>
 #include <QVariant>
@@ -52,7 +53,7 @@ class RichString;
 class Relationships;
 
 class WorksheetPrivate;
-class Q_XLSX_EXPORT Worksheet
+class Q_XLSX_EXPORT Worksheet : public OOXmlFile
 {
     Q_DECLARE_PRIVATE(Worksheet)
 public:
@@ -142,9 +143,7 @@ private:
     void setSheetName(const QString &sheetName);
 
     void saveToXmlFile(QIODevice *device) const;
-    QByteArray saveToXmlData() const;
     bool loadFromXmlFile(QIODevice *device);
-    bool loadFromXmlData(const QByteArray &data);
 
     bool isChartsheet() const;
     bool isHidden() const;
@@ -154,8 +153,6 @@ private:
     Drawing *drawing() const;
     void setDrawing(Drawing *d);
     QString drawingPath() const;
-
-    WorksheetPrivate * const d_ptr;
 };
 
 QT_END_NAMESPACE_XLSX
diff --git a/src/xlsx/xlsxworksheet_p.h b/src/xlsx/xlsxworksheet_p.h
index 41cfd56..ae70372 100644
--- a/src/xlsx/xlsxworksheet_p.h
+++ b/src/xlsx/xlsxworksheet_p.h
@@ -38,6 +38,7 @@
 
 #include "xlsxglobal.h"
 #include "xlsxworksheet.h"
+#include "xlsxooxmlfile_p.h"
 #include "xlsxcell.h"
 #include "xlsxdatavalidation.h"
 #include "xlsxconditionalformatting.h"
@@ -112,7 +113,7 @@ struct XlsxColumnInfo
     bool collapsed;
 };
 
-class XLSX_AUTOTEST_EXPORT WorksheetPrivate
+class XLSX_AUTOTEST_EXPORT WorksheetPrivate : public OOXmlFilePrivate
 {
     Q_DECLARE_PUBLIC(Worksheet)
 public:
@@ -143,7 +144,6 @@ public:
 
     SharedStrings *sharedStrings() const;
 
-    Worksheet *q_ptr;
     Workbook *workbook;
     mutable Relationships relationships;
     Drawing *drawing;
diff --git a/tests/auto/propsapp/tst_docpropsapptest.cpp b/tests/auto/propsapp/tst_docpropsapptest.cpp
index b484e4a..e0bf37a 100644
--- a/tests/auto/propsapp/tst_docpropsapptest.cpp
+++ b/tests/auto/propsapp/tst_docpropsapptest.cpp
@@ -31,7 +31,8 @@ void DocPropsAppTest::testCase1()
     f1.close();
 
     f1.open(QFile::ReadOnly);
-    QXlsx::DocPropsApp props2 = QXlsx::DocPropsApp::loadFromXmlFile(&f1);
+    QXlsx::DocPropsApp props2;
+    props2.loadFromXmlFile(&f1);
 
     QCOMPARE(props2.property("company"), QString("HMI CN"));
     QCOMPARE(props2.property("manager"), QString("Debao"));
diff --git a/tests/auto/propscore/tst_propscoretest.cpp b/tests/auto/propscore/tst_propscoretest.cpp
index aac729c..ae511cf 100644
--- a/tests/auto/propscore/tst_propscoretest.cpp
+++ b/tests/auto/propscore/tst_propscoretest.cpp
@@ -32,7 +32,8 @@ void DocPropsCoreTest::testCase1()
     f1.close();
 
     f1.open(QFile::ReadOnly);
-    QXlsx::DocPropsCore props2 = QXlsx::DocPropsCore::loadFromXmlFile(&f1);
+    QXlsx::DocPropsCore props2;
+    props2.loadFromXmlFile(&f1);
 
     QCOMPARE(props2.property("creator"), QString("Debao"));
     QCOMPARE(props2.property("keywords"), QString("Test, test, TEST"));
diff --git a/tests/auto/worksheet/tst_worksheet.cpp b/tests/auto/worksheet/tst_worksheet.cpp
index c9e0e81..1a58534 100644
--- a/tests/auto/worksheet/tst_worksheet.cpp
+++ b/tests/auto/worksheet/tst_worksheet.cpp
@@ -117,7 +117,7 @@ void WorksheetTest::testWriteCells()
     QVERIFY2(xmldata.contains("<c r=\"A5\" t=\"str\"><f>44+33</f><v>0</v></c>"), "formula");
     QVERIFY2(xmldata.contains("<c r=\"B5\" t=\"str\"><f>44+33</f><v>77</v></c>"), "formula");
 
-    QCOMPARE(sheet.d_ptr->sharedStrings()->getSharedString(0).toPlainString(), QStringLiteral("Hello"));
+    QCOMPARE(sheet.d_func()->sharedStrings()->getSharedString(0).toPlainString(), QStringLiteral("Hello"));
 }
 
 void WorksheetTest::testWriteHyperlinks()
@@ -137,11 +137,11 @@ void WorksheetTest::testWriteHyperlinks()
     QVERIFY2(xmldata.contains("<hyperlink ref=\"D1\" r:id=\"rId4\"/>"), "mail");
     QVERIFY2(xmldata.contains("<hyperlink ref=\"E1\" r:id=\"rId5\"/>"), "mail with subject");
 
-    QCOMPARE(sheet.d_ptr->sharedStrings()->getSharedString(0).toPlainString(), QStringLiteral("http://qt-project.org"));
-    QCOMPARE(sheet.d_ptr->sharedStrings()->getSharedString(1).toPlainString(), QStringLiteral("http://qt-project.org/abc"));
-    QCOMPARE(sheet.d_ptr->sharedStrings()->getSharedString(2).toPlainString(), QStringLiteral("http://qt-project.org/abc.html#test"));
-    QCOMPARE(sheet.d_ptr->sharedStrings()->getSharedString(3).toPlainString(), QStringLiteral("xyz@debao.me"));
-    QCOMPARE(sheet.d_ptr->sharedStrings()->getSharedString(4).toPlainString(), QStringLiteral("xyz@debao.me?subject=Test"));
+    QCOMPARE(sheet.d_func()->sharedStrings()->getSharedString(0).toPlainString(), QStringLiteral("http://qt-project.org"));
+    QCOMPARE(sheet.d_func()->sharedStrings()->getSharedString(1).toPlainString(), QStringLiteral("http://qt-project.org/abc"));
+    QCOMPARE(sheet.d_func()->sharedStrings()->getSharedString(2).toPlainString(), QStringLiteral("http://qt-project.org/abc.html#test"));
+    QCOMPARE(sheet.d_func()->sharedStrings()->getSharedString(3).toPlainString(), QStringLiteral("xyz@debao.me"));
+    QCOMPARE(sheet.d_func()->sharedStrings()->getSharedString(4).toPlainString(), QStringLiteral("xyz@debao.me?subject=Test"));
 }
 
 void WorksheetTest::testWriteDataValidations()
@@ -198,10 +198,10 @@ void WorksheetTest::testReadSheetData()
     reader.readNextStartElement();//current node is sheetData
 
     QXlsx::Worksheet sheet("", 1, 0);
-    sheet.d_ptr->sharedStrings()->addSharedString("Hello");
-    sheet.d_ptr->loadXmlSheetData(reader);
+    sheet.d_func()->sharedStrings()->addSharedString("Hello");
+    sheet.d_func()->loadXmlSheetData(reader);
 
-    QCOMPARE(sheet.d_ptr->cellTable.size(), 2);
+    QCOMPARE(sheet.d_func()->cellTable.size(), 2);
 
     //A1
     QCOMPARE(sheet.cellAt("A1")->dataType(), QXlsx::Cell::String);
@@ -239,10 +239,10 @@ void WorksheetTest::testReadColsInfo()
     reader.readNextStartElement();//current node is cols
 
     QXlsx::Worksheet sheet("", 1, 0);
-    sheet.d_ptr->loadXmlColumnsInfo(reader);
+    sheet.d_func()->loadXmlColumnsInfo(reader);
 
-    QCOMPARE(sheet.d_ptr->colsInfo.size(), 1);
-    QCOMPARE(sheet.d_ptr->colsInfo[9]->width, 5.0);
+    QCOMPARE(sheet.d_func()->colsInfo.size(), 1);
+    QCOMPARE(sheet.d_func()->colsInfo[9]->width, 5.0);
 }
 
 void WorksheetTest::testReadRowsInfo()
@@ -259,10 +259,10 @@ void WorksheetTest::testReadRowsInfo()
     reader.readNextStartElement();//current node is sheetData
 
     QXlsx::Worksheet sheet("", 1, 0);
-    sheet.d_ptr->loadXmlSheetData(reader);
+    sheet.d_func()->loadXmlSheetData(reader);
 
-    QCOMPARE(sheet.d_ptr->rowsInfo.size(), 1);
-    QCOMPARE(sheet.d_ptr->rowsInfo[3]->height, 40.0);
+    QCOMPARE(sheet.d_func()->rowsInfo.size(), 1);
+    QCOMPARE(sheet.d_func()->rowsInfo[3]->height, 40.0);
 }
 
 void WorksheetTest::testReadMergeCells()
@@ -273,10 +273,10 @@ void WorksheetTest::testReadMergeCells()
     reader.readNextStartElement();//current node is mergeCells
 
     QXlsx::Worksheet sheet("", 1, 0);
-    sheet.d_ptr->loadXmlMergeCells(reader);
+    sheet.d_func()->loadXmlMergeCells(reader);
 
-    QCOMPARE(sheet.d_ptr->merges.size(), 2);
-    QCOMPARE(sheet.d_ptr->merges[0].toString(), QStringLiteral("B1:B5"));
+    QCOMPARE(sheet.d_func()->merges.size(), 2);
+    QCOMPARE(sheet.d_func()->merges[0].toString(), QStringLiteral("B1:B5"));
 }
 
 void WorksheetTest::testReadDataValidations()
@@ -290,10 +290,10 @@ void WorksheetTest::testReadDataValidations()
     reader.readNextStartElement();//current node is dataValidations
 
     QXlsx::Worksheet sheet("", 1, 0);
-    sheet.d_ptr->loadXmlDataValidations(reader);
+    sheet.d_func()->loadXmlDataValidations(reader);
 
-    QCOMPARE(sheet.d_ptr->dataValidationsList.size(), 2);
-    QCOMPARE(sheet.d_ptr->dataValidationsList[0].validationType(), QXlsx::DataValidation::Whole);
+    QCOMPARE(sheet.d_func()->dataValidationsList.size(), 2);
+    QCOMPARE(sheet.d_func()->dataValidationsList[0].validationType(), QXlsx::DataValidation::Whole);
 }
 
 QTEST_APPLESS_MAIN(WorksheetTest)