The first line of any 💄📝 Les·M·L document should be the string
`#!lesml`.
-
-Following the shebang, document metadata may be provided in the [Record
- Jar][draft-phillips-record-jar-01] format.
+A language tag may follow this, beginning with `@` and terminated with
+ `$`, like so:
+`#!lesml@en$`.
+Regardless of whether a language tag is present, the shebang line may
+ be terminated by a space‐separated list of properties of the form
+ `key=value`.
+Only one property is currently permitted: `profile`, whose value should
+ be a U·R·I and is translated to the `@data-lesml-profile` attribute
+ on the resulting `<html:article>` element.
+
+Following the shebang line, document metadata may be provided in the
+ [Record Jar][draft-phillips-record-jar-01] format.
The body of the document begins after the last line which begins with
the string `%%`, or after the shebang line if none exists.