This makes it easier to debug complex DI scripts. The Level parameter is a positive integer, which can currently have these values:

0: No debugging (default)
1: Echo each interpreted command, as it occurs in the source file
2: First echo the command, then show the way it looks after variables have been expanded
3: Like level 2, but the contents of false .IF statements are also shown

Example:

<!--.set foo="some string"-->
<!--.debug 1-->
<!--.echo "<P>foo is \"$foo\"</P>"-->
<!--.debug 2-->
<!--.if "$foo" eq "not this"-->
  <!--.echo "Should never get here"-->
<!--.endif-->

[DEBUG] debug 1
[DEBUG] echo "<P>foo is \"$foo\"</P>"

foo is "some string"

[DEBUG] debug 2
[DEBUG] if "$foo" eq "not this"
[DEBUG] IF • "some string" • eq • "not this"