| DATA | Valeurs possibles |
| alpha | A-Z a-z _ (underscore) |
| alphanum | alpha digit |
| any_char | alpha digit otherchar # space @@ |
| delim | space |
| digit | 0 - 9 |
| escape | @# + escape_text + @ + non_at |
| escape_text | any_char escape_text + any_char |
| level | digit level + digit sans zéros non significatifs. |
| line_item | any_char escape line_item + any_char line_item + escape |
| line_value | pointer line_item |
| non_at | alpha digit otherchar space # |
| null | nothing |
| optional_line_value | [line_value + delim] |
| optional_xref_Id | xref_Id + delim |
| otherchar | ! " $ % & ' ( ) * + , - . / : ; < = > ? [ \ ] ^ ` { | } ~ ASCII >127 |
| pointer | @ + alphanum + pointer_string + @ |
| pointer_char | non_at |
| pointer_string | null pointer_char pointer_string + pointer_char |
| tag | alphanum tag + alphanum |
| terminator | carriage_return line_feed carriage_return + line_feed line_feed + carriage_return |
| xref_id | [pointer] |