名称

模式定义

P1

create pattern $P1 (/buy{$n, $v})

where tag($n) = ‘number’ and tag($v) = ‘value’ and $v > 1000

P2

create pattern $P2 (/sell{$n, $v})

where tag($n) = ‘number’ and tag($v) = ‘value’ and $v < 50

P3

create pattern $P3 (/warning{$n, $v})

where tag($n) = ‘number’ and tag($v) = ‘value’

P2

create pattern $P4 (/buy{$n, $v})

where tag($n) = ‘number’ and tag($v) = ‘value’ and $v < 100