code: public static Attribute createAttribute(String name, String friendlyName) {
      return createAttribute(name, friendlyName, Attribute.URI_REFERENCE);
    }
docs: Creates an {@code Attribute} with the given name (and friendly name) and with a name format of
  {@value Attribute#URI_REFERENCE}.
  
  @param name
  the attribute name
  @param friendlyName
  the attribute friendly name (may be {@code null})
  @return an {@code Attribute} object
  @see #createAttribute(String, String, String)