xml - xquery 多 if-else 语句

Question

使用 xPath，我从 html 字段中获取数据，此数据可以采用以下格式(包括括号):

DATA |||| symbols i'm using to explain my code

(bornPlace, bornDate-DeathDate) |||| (str, A-B) = note that str may also contain '-'

(bornPlace, bornDate) |||| (str, A)

(bornPlace) |||| (str)

(bornDate-DeathDate) |||| (A-B)

(bornDate) |||| (A)

Or completely empty

我正在尝试使用多个 if-else 语句将每个元素检索到单独的变量中，但它似乎不喜欢多行命令(我认为是这样)。

我已经编写了一个无法正常工作的代码:-/(它说期待返回，发现其他如果......)

let $temp1 := data(normalize-space(substring-before(substring-after(//div/div[2]/h2/text(), '('), ')')))

if (contains($temp1,','))           (:   (str, A-B) or (str, A)   :)
then
    let $bornPlace := substring-before($temp1, ',')
    let $temp2 := substring-after($temp1, ',')

    if (contains($temp2,'-'))
    then
        let $bornDate := substring-before($temp2, '-')
        let $deathDate := substring-after($temp2, '-')
    else
        let $bornDate := $temp2
        let $deathDate := data('')

else if (contains($temp1,'-'))
    then                            (:   (s-t-r) or (A-B)   :)
        let $temp2 := normalize-space(substring-before($temp1, '-'))
        if (number($temp2)=$temp2)     (: it's a number :)
        then
            let $bornDate := temp2
            let $deathDate := normalize-space(substring-after($temp2, '-'))
            let $bornPlace := data('')
        else
            let $bornPlace := $temp1
            let $bornDate := data('')
            let $deathDate := data('')
    else                            (:   (str) or (A)   :)
        if (number($temp1)=$temp1)     (: it's a number :)
        then
            let $bornDate := temp1
            let $deathDate := data('')
            let $bornPlace := data('')
        else
            let $bornPlace := $temp1
            let $bornDate := data('')
            let $deathDate := data('')

此外，如果有更漂亮的方法来做到这一点，我会接受 :D

在此先感谢您的帮助:)

Answer 1

let 子句不是表达式。你需要改变这种逻辑

if (contains($temp2,'-'))
    then
        let $bornDate := substring-before($temp2, '-')
        let $deathDate := substring-after($temp2, '-')
    else
        let $bornDate := $temp2
        let $deathDate := data('')

由此

let $hyphenated := contains($temp2, '-')
let $bornDate := if ($hyphenated) then substring-before($temp2, '-') else $temp2
let $deathDate := if ($hyphenated) then substring-after($temp2, '-') else ''
return ...

虽然在这种特殊情况下我会倾向于写:

let $tokens := tokenize($temp2, '-')
let $bornDate := $tokens[1]
let $deathDate := string($tokens[2])
return ...