Quite simply, should a sentence read "a XML report" or "an XML report"?
marked as duplicate by KitFox♦, JSBձոգչ, psmears, FumbleFingers, kiamlaluno Jun 30 '11 at 20:15
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It's "an XML report", because which form of the indefinite article to use is decided by how its noun is pronounced. In this case, it's pronounced:
And as 'XML' begins with a vowel sound, 'e', so 'an' is used rather than 'a'.