"A" vs. "an"
Use "a" if the first letter of the following word is pronounced as a consonant.
Wrong: "A historical view of an UML diagram is better than a XML document."
Right: "An historical view of a UML diagram is better than an XML document." Note the pronunciation, which is what counts:
- "An istorical view" [NB: Americans might prefer "A historical view" after all.]
- "a yoo-em-ell diagram"
- "an ex-em-ell document"
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