+// Widgets
+const static char* WDG_INFO = "label";
+const static char* WDG_DOUBLEVALUE = "doublevalue";
+const static char* WDG_BOOLVALUE = "boolvalue";
+const static char* WDG_STRINGVALUE = "stringvalue";
+const static char* WDG_MULTISELECTOR = "multi_selector";
+const static char* WDG_SHAPE_SELECTOR = "shape_selector";
+const static char* WDG_CHOICE = "choice";
+const static char* WDG_DOUBLEVALUE_EDITOR = "doublevalue_editor";
+const static char* WDG_FILE_SELECTOR= "file_selector";
+// Containers
+const static char* WDG_GROUP = "groupbox";
+const static char* WDG_CHECK_GROUP = "check_groupbox";
+const static char* WDG_TOOLBOX = "toolbox";
+const static char* WDG_TOOLBOX_BOX = "box";
+const static char* WDG_SWITCH = "switch";
+const static char* WDG_SWITCH_CASE = "case";
+// Common properties (xml attributes of nodes)