code: @Override
      public String getPrefix() {
          String prefix = "";
  
          switch (nodeKind) {
          case ELEMENT:
          case ATTRIBUTE:
              prefix = qName.getPrefix();
              break;
          default:
              /*
               * Change nothing, return empty String in case of a treeData which isn't
               * an element or attribute.
               */
          }
  
          return prefix;
      }
docs: {@inheritDoc}