为什么不同的值在非原子化序列上不产生不同的值

Question

为什么

(<benefitStartDate>20170101</benefitStartDate>,<benefitEndDate>20170301</benefitEndDate>,
<benefitStartDate>20170101</benefitStartDate>,<benefitEndDate>20170501</benefitEndDate>)/distinct-values(.)

产量 20170101 20170301 20170101 20170501（即不消除重复项）

但将其应用于序列的原子化版本

distinct-values((20170701,20170301,20170701,20170501)) 产量

20170701 20170301 20170501

Answer 1

(
  <benefitStartDate>20170101</benefitStartDate>,<benefitEndDate>20170301</benefitEndDate>,
  <benefitStartDate>20170101</benefitStartDate>,<benefitEndDate>20170501</benefitEndDate>
)/distinct-values(.)

不等于：

distinct-values(
  <benefitStartDate>20170101</benefitStartDate>,<benefitEndDate>20170301</benefitEndDate>,
  <benefitStartDate>20170101</benefitStartDate>,<benefitEndDate>20170501</benefitEndDate>
)

后者 returns 元素序列的不同值。

您的代码 returns 每个元素的不同值，就像调用：

(
  distinct-values(<benefitStartDate>20170101</benefitStartDate>),
  distinct-values(<benefitEndDate>20170301</benefitEndDate>),
  distinct-values(<benefitStartDate>20170101</benefitStartDate>),
  distinct-values(<benefitEndDate>20170501</benefitEndDate>)
)

另一种变体，returns 您期望的结果是：

(
  <benefitStartDate>20170101</benefitStartDate>,<benefitEndDate>20170301</benefitEndDate>,
  <benefitStartDate>20170101</benefitStartDate>,<benefitEndDate>20170501</benefitEndDate>
) => distinct-values()

最佳

迈克尔

为什么不同的值在非原子化序列上不产生不同的值

Why does distinct-values not yield distinct values on a non-atomized sequence

xpath

distinct-values