Each mode definition must begin with the following:
<?xml version="1.0"?> <!DOCTYPE MODE SYSTEM "xmode.dtd">
Each mode definition must also contain exactly one
        MODE tag. All other tags (PROPS,
        RULES) must be placed inside the
        MODE tag. The MODE tag does not
        have any defined attributes. Here is an example:
<MODE>
    ... mode definition goes here ...
</MODE>