The tools accept standard C representations for <EM>int</EM> and
<EM>double</EM> types.
For the <A NAME=k:bool><EM>bool</EM></A> type, TRUE values are
-represented by "true" (case-insensitive)
-and any non-zero integer, and FALSE values by "false" (case-insensitive)
+represented by "true" or "yes" (case-insensitive)
+and any non-zero integer, and FALSE values by "false" or "no" (case-insensitive)
and zero.
In addition, there are a variety of specialized types such as
<EM>arrowType</EM>, <EM>color</EM>,