by automatic tools such as integrated development environments.
</p>

<h2 id="Notation">Notation</h2>
<p>
The syntax is specified using a
<a href="https://en.wikipedia.org/wiki/Wirth_syntax_notation">variant</a>
of Extended Backus-Naur Form (EBNF):
</p>

<pre class="grammar">
Syntax      = { Production } .
Production  = production_name "=" [ Expression ] "." .
Expression  = Term { "|" Term } .

        "properties": {
          "name": {
            "default": "",
            "description": "The header field name. This will be canonicalized upon output, so case-variant names will be understood as the same header.",
            "type": "string"
          },
          "value": {
            "default": "",
            "description": "The header field value",