code: protected String documentation() {
          if (documentation != null)
              return documentation;
          if (docPath != null) {
              // read from file
              try {
                  InputStream s = docPath.openInputStream();
                  documentation = readHTMLDocumentation(s, docPath);
              } catch (IOException exc) {
                  documentation = "";
                  env.error(null, "javadoc.File_Read_Error", docPath.getName());
              }
          } else {
              // no doc file to be had
              documentation = "";
          }
          return documentation;
      }
docs: Do lazy initialization of "documentation" string.