the document relationship file can be splitted too, so take care of that

svn path=/trunk/KDE/kdegraphics/okular/; revision=825362

generators/xps/generator_xps.cpp

@@ -1477,7 +1477,7 @@ XpsDocument::XpsDocument(XpsFile *file, const QString &fileName): m_file(file),
     QString documentStructureFile;
     if ( relFile ) {
         QXmlStreamReader xml;
-        xml.addData( relFile->data() );
+        xml.addData( readFileOrDirectoryParts( relFile ) );
         while ( !xml.atEnd() )
         {
             xml.readNext();