In jEdit 4.1, the mode file grammar has been cleaned up somewhat. As a result, some edit modes written for jEdit 4.0 and earlier need to be updated:
Defining <WHITESPACE> rules is no
longer necessary and doing so will print warnings to the
activity logs.
The <KEYWORDS> tag no longer
accepts an IGNORE_CASE attribute. Set the
IGNORE_CASE attribute of the
<RULES> tag instead.
The <END> tag of the
<SPAN> rule used to be optional, in
which case any occurrence of the start string would cause the
remainder of the buffer to be highlighted with the span. In
jEdit 4.1, the <END> tag can no longer
be omitted, however a <SEQ> tag with a
DELEGATE attribute can be used to achieve the
same effect as endless span.
Defining <SEQ TYPE="NULL"> rules
for word separators is no longer necessary. Now, any
non-alphanumeric character not appearing in a keyword definition
or the ruleset's NO_WORD_SEP attribute is
considered a word separator.