diff --git a/sources/qetproject.cpp b/sources/qetproject.cpp
index b4f16b8a4..c485ec41c 100644
--- a/sources/qetproject.cpp
+++ b/sources/qetproject.cpp
@@ -159,7 +159,7 @@ void QETProject::init()
 	writeBackup();
 
 	QSettings settings;
-	int autosave_interval = settings.value("diagrameditor/autosave-interval", 0).toInt();
+	int autosave_interval = settings.value(QStringLiteral("diagrameditor/autosave-interval"), 0).toInt();
 	if(autosave_interval > 0)
 	{
 		int ms = autosave_interval*60*1000;
@@ -1280,13 +1280,13 @@ void QETProject::readProjectXml(QDomDocument &xml_project)
 	m_state = ProjectParsingRunning;
 
 	//The roots of the xml document must be a "project" element
-	if (root_elmt.tagName() == "project")
+	if (root_elmt.tagName() == QLatin1String("project"))
 	{
 		//Normal opening mode
-		if (root_elmt.hasAttribute("version"))
+		if (root_elmt.hasAttribute(QStringLiteral("version")))
 		{
 			bool conv_ok;
-			m_project_qet_version = root_elmt.attribute("version").toDouble(&conv_ok);
+			m_project_qet_version = root_elmt.attribute(QStringLiteral("version")).toDouble(&conv_ok);
 #if TODO_LIST
 #pragma message("@TODO use of version convert")
 #endif
@@ -1333,7 +1333,7 @@ void QETProject::readProjectXml(QDomDocument &xml_project)
 				}
 			}
 		}
-		setTitle(root_elmt.attribute("title"));
+		setTitle(root_elmt.attribute(QStringLiteral("title")));
 	}
 	else
 	{
@@ -1383,7 +1383,7 @@ void QETProject::readDiagramsXml(QDomDocument &xml_project)
 	}
 
 	//Search the diagrams in the project
-	QDomNodeList diagram_nodes = xml_project.elementsByTagName("diagram");
+	QDomNodeList diagram_nodes = xml_project.elementsByTagName(QStringLiteral("diagram"));
 
 	if(dlgWaiting)
 		dlgWaiting->setProgressBarRange(0, diagram_nodes.length()*3);
@@ -1402,7 +1402,7 @@ void QETProject::readDiagramsXml(QDomDocument &xml_project)
 
 			int diagram_order = -1;
 			if (!QET::attributeIsAnInteger(diagram_xml_element,
-							   "order",
+							   QStringLiteral("order"),
 							   &diagram_order))
 				diagram_order = 500000;
 
@@ -1445,7 +1445,7 @@ void QETProject::readDiagramsXml(QDomDocument &xml_project)
 void QETProject::readElementsCollectionXml(QDomDocument &xml_project)
 {
 		//Get the embedded elements collection of the project
-	QDomNodeList collection_roots = xml_project.elementsByTagName("collection");
+	QDomNodeList collection_roots = xml_project.elementsByTagName(QStringLiteral("collection"));
 	QDomElement collection_root;
 
 	if (!collection_roots.isEmpty())
@@ -1470,8 +1470,8 @@ void QETProject::readElementsCollectionXml(QDomDocument &xml_project)
 */
 void QETProject::readProjectPropertiesXml(QDomDocument &xml_project)
 {
-	foreach (QDomElement e, QET::findInDomElement(xml_project.documentElement(), "properties"))
-		m_project_properties.fromXml(e);
+	for (auto dom_elmt : QET::findInDomElement(xml_project.documentElement(), QStringLiteral("properties")))
+		m_project_properties.fromXml(dom_elmt);
 }
 
 /**
@@ -1483,7 +1483,7 @@ void QETProject::readProjectPropertiesXml(QDomDocument &xml_project)
 void QETProject::readDefaultPropertiesXml(QDomDocument &xml_project)
 {
 		// Find xml element where is stored properties for new diagram
-	QDomNodeList newdiagrams_nodes = xml_project.elementsByTagName("newdiagrams");
+	QDomNodeList newdiagrams_nodes = xml_project.elementsByTagName(QStringLiteral("newdiagrams"));
 	if (newdiagrams_nodes.isEmpty()) return;
 
 	QDomElement newdiagrams_elmt = newdiagrams_nodes.at(0).toElement();
@@ -1503,21 +1503,21 @@ void QETProject::readDefaultPropertiesXml(QDomDocument &xml_project)
 		QDomElement child_elmt = child.toElement();
 		if (child_elmt.isNull()) continue;
 
-		if (child_elmt.tagName() == "border")
+		if (child_elmt.tagName() == QLatin1String("border"))
 			border_elmt = child_elmt;
-		else if (child_elmt.tagName() == "inset")
+		else if (child_elmt.tagName() == QLatin1String("inset"))
 			titleblock_elmt = child_elmt;
-		else if (child_elmt.tagName() == "conductors")
+		else if (child_elmt.tagName() == QLatin1String("conductors"))
 			conductors_elmt = child_elmt;
-		else if (child_elmt.tagName() == "report")
+		else if (child_elmt.tagName() == QLatin1String("report"))
 			report_elmt = child_elmt;
-		else if (child_elmt.tagName() == "xrefs")
+		else if (child_elmt.tagName() == QLatin1String("xrefs"))
 			xref_elmt = child_elmt;
-		else if (child_elmt.tagName() == "conductors_autonums")
+		else if (child_elmt.tagName() == QLatin1String("conductors_autonums"))
 			conds_autonums = child_elmt;
-		else if (child_elmt.tagName()== "folio_autonums")
+		else if (child_elmt.tagName()== QLatin1String("folio_autonums"))
 			folio_autonums = child_elmt;
-		else if (child_elmt.tagName()== "element_autonums")
+		else if (child_elmt.tagName()== QLatin1String("element_autonums"))
 			element_autonums = child_elmt;
 	}
 
@@ -1525,21 +1525,21 @@ void QETProject::readDefaultPropertiesXml(QDomDocument &xml_project)
 	if (!border_elmt.isNull())	   default_border_properties_.fromXml(border_elmt);
 	if (!titleblock_elmt.isNull()) default_titleblock_properties_.fromXml(titleblock_elmt);
 	if (!conductors_elmt.isNull()) default_conductor_properties_.fromXml(conductors_elmt);
-	if (!report_elmt.isNull())	   setDefaultReportProperties(report_elmt.attribute("label"));
+	if (!report_elmt.isNull())	   setDefaultReportProperties(report_elmt.attribute(QStringLiteral("label")));
 	if (!xref_elmt.isNull())
 	{
-		foreach(QDomElement elmt, QET::findInDomElement(xref_elmt, "xref"))
+		for (auto elmt : QET::findInDomElement(xref_elmt, QStringLiteral("xref")))
 		{
 			XRefProperties xrp;
 			xrp.fromXml(elmt);
-			m_default_xref_properties.insert(elmt.attribute("type"), xrp);
+			m_default_xref_properties.insert(elmt.attribute(QStringLiteral("type")), xrp);
 		}
 	}
 	if (!conds_autonums.isNull())
 	{
-		m_current_conductor_autonum = conds_autonums.attribute("current_autonum");
-		m_freeze_new_conductors = conds_autonums.attribute("freeze_new_conductors") == "true";
-		foreach (QDomElement elmt, QET::findInDomElement(conds_autonums, "conductor_autonum"))
+		m_current_conductor_autonum = conds_autonums.attribute(QStringLiteral("current_autonum"));
+		m_freeze_new_conductors = conds_autonums.attribute(QStringLiteral("freeze_new_conductors")) == QLatin1String("true");
+		for (auto elmt : QET::findInDomElement(conds_autonums, QStringLiteral("conductor_autonum")))
 		{
 			NumerotationContext nc;
 			nc.fromXml(elmt);
@@ -1548,22 +1548,22 @@ void QETProject::readDefaultPropertiesXml(QDomDocument &xml_project)
 	}
 	if (!folio_autonums.isNull())
 	{
-		foreach (QDomElement elmt, QET::findInDomElement(folio_autonums, "folio_autonum"))
+		for (auto elmt : QET::findInDomElement(folio_autonums, QStringLiteral("folio_autonum")))
 		{
 			NumerotationContext nc;
 			nc.fromXml(elmt);
-			m_folio_autonum.insert(elmt.attribute("title"), nc);
+			m_folio_autonum.insert(elmt.attribute(QStringLiteral("title")), nc);
 		}
 	}
 	if (!element_autonums.isNull())
 	{
-		m_current_element_autonum = element_autonums.attribute("current_autonum");
-		m_freeze_new_elements = element_autonums.attribute("freeze_new_elements") == "true";
-		foreach (QDomElement elmt, QET::findInDomElement(element_autonums, "element_autonum"))
+		m_current_element_autonum = element_autonums.attribute(QStringLiteral("current_autonum"));
+		m_freeze_new_elements = element_autonums.attribute(QStringLiteral("freeze_new_elements")) == QLatin1String("true");
+		for (auto elmt : QET::findInDomElement(element_autonums, QStringLiteral("element_autonum")))
 		{
 			NumerotationContext nc;
 			nc.fromXml(elmt);
-			m_element_autonum.insert(elmt.attribute("title"), nc);
+			m_element_autonum.insert(elmt.attribute(QStringLiteral("title")), nc);
 		}
 	}
 }