如何在 xpath marklogic 中的变量中传递元素名称？

Question

My

let $doc :=
  <Test>
    <Abc>value of the element</Abc>

  </Test>

Code -

for $i in $doc
let $x := 'Abc'
return $i/$x

result expected 'value of the element'

please help!!

TIA

Answer 1

In your code example, you let the $x variable and assigned a string 'Abc' . If you wanted to use that string to find elements that have that name, you could adjust your XPath to select child elements and then in a predicate filter, test whether the name() or local-name() . Either can work if you know there are no namespaces and namespace-prefixes to deal with, but probably best to use local-name() .

$doc/*[local-name()=$x] 

That would select the Abc element, but if you wanted just the value, you could then select the text() node

for $i in $doc
let $x := 'Abc'
return $i/*[local-name()=$x]/text()

or apply the string() function:

for $i in $doc
let $x := 'Abc'
return $i/*[local-name()=$x]/string()

If you know that it will be the Abc element, then you can eliminate the $x variable:

for $i in $doc/Abc
return $i/string()

And you could eliminate the for loop completely and just use an XPath statement like this:

$doc/Abc/string()