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I wrote this sentence:
While, in the extraction algorithm, they may consider context before classifying an element, the contextual information are not explicitly specified at the rules level (or even at the extraction rules level).
I supposed two levels for this program, the algorithm, and some rules which are input to the algorithm, then used "at the rules level". Am I correct at this? (By the way, correct takes at preposition, doesn't it?)
I would consider rule level as a noun phrase. Levels usually are not singular, same as you might write in a company:
That policy will be decided at the management level. (not managements).
Otherwise, your example makes sense, but I have to make an assumption that contextual information is multiple items, otherwise use is not are.
While, in the extraction algorithm, they may consider context before classifying an element, the contextual information are not explicitly specified at the rule level (or even at the extraction rule level).
