XTCE13 — rangeForm annotation needs work

The rangeForm annotation is vague and needs improvement. There are two places it occurs – one at the attribute level with another brief mention at the schema type:
"A value of outside specifies that the most severe range is outside all the other ranges: -severe -critical -distress -warning -watch normal +watch +warning +distress +critical +severe. A value of inside "inverts" these bands: -green -watch -warning -distress -critical severe +critical +distress +warning +watch. The most common form used is "outside" and is the default."

The key problem is the term "inverts" is not really defined and so the entire explanation is overly general.