code: public String get(String key) {
          int i = indexOfKey(key);
          return i == NotFound ? EmptyString : checkNotNull(vals[i]);
      }
docs: Get an attribute value by key.
  @param key the (case-sensitive) attribute key
  @return the attribute value if set; or empty string if not set (or a boolean attribute).
  @see #hasKey(String)