The best thing to do with any of Phil Barkers rules is not to "take anything as" at all.
His language may be a bit old-fashioned, but he's almost always explicit and says exactly what he means.
If you're having trouble with the rule then chances are you are trying to read somethign into it that is not there, making assumptions from DBM, R or A, or somethign similar. this is always a mistake.
Way back when DBM came out we used to have a mantra that "the rules say what they mean, and mean what they say" - a variation on RTFM, and it is possibly time to roll it out again!