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   The query language processor is activated on the simple search entry when
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   The query language processor is activated on the simple search entry when
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   the search mode selector is set to Query Language.
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   the search mode selector is set to Query Language.
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   Here follows a sample request that we are going to explain:
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   Here follows a sample request that we are going to explain:
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           mime:message/rfc822 author:"john doe" Beatles OR Lennon Live OR Unplugged -potatoes
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           author:"john doe" Beatles OR Lennon Live OR Unplugged -potatoes
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   This would search for all email messages with John Doe appearing as a
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   This would search for all documents with John Doe appearing as a phrase in
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   phrase in the From: header, and containing either beatles or lennon and
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   the author field (exactly what this is would depend on the document type,
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   either live or unplugged but not potatoes.
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   ie: the From: header, for an email message), and containing either beatles
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   or lennon and either live or unplugged but not potatoes (in any part of
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   the document).
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   The first element, mime:message/rfc822 is a special switch that restricts
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   the results to be email messages. There could be several such switches,
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   which would form a list of allowed types.
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   The second element author:"john doe" is a phrase search limited to a
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   The first element author:"john doe" is a phrase search limited to a
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   specific field. Phrase searches are specified as usual by enclosing the
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   specific field. Phrase searches are specified as usual by enclosing the
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   words in double quotes. The field specification appears before the colon.
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   words in double quotes. The field specification appears before the colon
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   (of course this is not limited to phrases, author:Balzac would be ok too).
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   Recoll currently manages the following fields:
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   Recoll currently manages the following fields:
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     * title, subject or caption are synonyms which specify data to be
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     * title, subject or caption are synonyms which specify data to be
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       searched for in the document title or subject.
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       searched for in the document title or subject.
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