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docs: querying and tokenizers
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### Querying
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The tokenizer is responsible for the initial parsing of the query. It needs
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to split the query into appropriate words and terms and match them against
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the saved tokens in the database. It then returns the list of possibly matching
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tokens and the list of possible splits to the query parser. The parser uses
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this information to compute all possible interpretations of the query and
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rank them accordingly.
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