Please can you explain the grammar structure 以。。为

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Oct 21, 2012 07:35
Please can you explain the grammar structure 以。。为 as in 淮河以北为北方,淮河以南为南方。How exactly should I translate this sentence, what is the 以。。为 doing and can you please give me some more examples using this 以。。为 structure.

Thank you.
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