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We (XSL WG) are finding it hard to see the relationship between the expected results of this query and the supplied input data. (The fact that the interval between arrivals is typically more than 15 minutes doesn't help.) A slightly more detailed description of the query would help: we identified two interesting cases to study: (a) people whose arrival time was earlier than (Clara's arrival time - 15 minutes) (but perhaps on the same day?) (b) people whose arrival time was earlier than Clara's arrival time but later than (Clara's arrival time - 15 minutes)
Added a clarification in the last working draft: 4.2.11 Q11 Identify every person who enters the building before Clara withing a 15 minute timeframe (Clara's arrival time - 15 minutes).
I'm marking this bug FIXED. Mike, if you agree with the resolution, please mark it CLOSED.