the XD and XDM were both manufactured with Nato ammo in mind. many manufactures marks their 9mm Nato as +P because it has higher pressures than standard 9mm para or 9x19mm. even though these calibers are all interchangeable some guns can not handle the extra pressures of Nato Spec ammo over time.
FWIW, the XDM has been proven several times to handle +P+ so I wouldn't worry about 9mm nato ammo.
ignore my complete lack of capitalization. I still have no problem correcting your grammar.
I never said half the crap people said I did-Albert Einstein
You can't believe everything you read on the internet-Benjamin Franklin
Bean counters told me I couldn't fire a man for being in a wheelchair, did it anyway. Ramps are expensive.-Cave Johnson.