code: private void initLayoutHeader() {
          headerLayout.setWidth("100%");
          headerLayout.setHeight("80px");
          headerLayout.setId("header");
  
          Link rdfunit = new Link("",
                  new ExternalResource("http://rdfunit.aksw.org/"));
          rdfunit.setIcon(new ThemeResource("images/logo-rdfunit.png"));
  
          headerLayout.addComponent(rdfunit);
  
          Link aksw = new Link("",
                  new ExternalResource("http://aksw.org/"));
          aksw.setIcon(new ThemeResource("images/logo-aksw.png"));
          aksw.addStyleName("align-right");
          headerLayout.addComponent(aksw);
      }
docs: /*
  setup the header of the page