jEdit edit mode for Asterisk AEL files

ael.xml

<?xml version="1.0"?>

<!DOCTYPE MODE SYSTEM "xmode.dtd">

<MODE>
    <PROPS>
        <PROPERTY NAME="lineComment" VALUE="//" />
    </PROPS>

    <RULES>
        <EOL_SPAN TYPE="COMMENT1">//</EOL_SPAN>
        <SPAN TYPE="KEYWORD3" NO_LINE_BREAK="TRUE">
          <BEGIN>${</BEGIN>
          <END>}</END>
        </SPAN>
        <MARK_FOLLOWING TYPE="KEYWORD2">&amp;</MARK_FOLLOWING>
        <MARK_FOLLOWING TYPE="LABEL" MATCH_TYPE="KEYWORD1">case </MARK_FOLLOWING>
        <MARK_PREVIOUS TYPE="LABEL">:</MARK_PREVIOUS>
        <MARK_PREVIOUS TYPE="FUNCTION" MATCH_TYPE="OPERATOR">(</MARK_PREVIOUS>
        <SPAN TYPE="LITERAL1" NO_LINE_BREAK="TRUE">
          <BEGIN>"</BEGIN>
          <END>"</END>
        </SPAN>
        <KEYWORDS>
          <KEYWORD1>if</KEYWORD1>
          <KEYWORD1>else</KEYWORD1>
          <KEYWORD1>while</KEYWORD1>
          <KEYWORD1>case</KEYWORD1>
          <KEYWORD1>switch</KEYWORD1>
          <KEYWORD1>break</KEYWORD1>
          <KEYWORD1>jump</KEYWORD1>
          <KEYWORD1>goto</KEYWORD1>
          <KEYWORD4>context</KEYWORD4>
          <KEYWORD4>macro</KEYWORD4>
        </KEYWORDS>
    </RULES>
</MODE>

This is my first try for a quickly-hacked together jEdit syntax highlighting for Asterisk AEL files. The alignment of nested braces doesn't quite work.
Comments and improvements are welcome.

To install, save the file in .jedit/modes and put the following line your your .jedit/modes/catalog file: