Hi all,
I'd like a function to add an attribute to an input element and return
it. I realize that xquery is functional, and the returned element will
be a new element rather than a modified version of the input element,
which is fine.
Consider the following function:
---
define function f($x as element(test))
as element(test)
{
xdmp:node-insert-child($x, attribute new { "new" } )
}
let $x := <test blah="blah">some text</test>
return f($x)
=> Error: Cannot update constructed nodes
---
This errors out and tells me "Cannot update constructed nodes", as
indicated in the API docs ("On-the-fly constructed nodes cannot be
updated.",
http://developer.marklogic.com/pubs/3.2/apidocs/UpdateBuiltins.html#node-insert-child)
Here's a workaround function:
---
define function g($x as element(test))
as element(test)
{
<test>{
$x/text(),
$x/child::*,
$x/attribute::*,
attribute new{ "new" }
}</test>
}
let $x := <test blah="blah">some text</test>
return g($x)
=> <test blah="blah" new="new">some text</test>
---
It works. Is there a better way though? Also, what's the point of
xdmp:node-insert-child if it can't operate on an argument to a function?
Why is the arg considered 'on-the-fly'? Shouldn't the function not
care where $x came from or how it was constructed?
Bonus question: If I have an $x as element(), how can I pull out the
element name? IE if $x := <hi />, I want "hi".
Cheers,
Eric
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