Question

Lets consider an example, a = ‘red table jet blue ghost hind’. Now i want i as b = [‘red’, ‘table’, ‘jet’, ‘blue’, ‘ghost’, ‘hind’]. In python we can use list comprehension, but in Xquery is there any method like “List Comprehension” ?

Answer 1

XQuery is based on the XDM (XPath Data Model) in which there are sequences.

A sequence is something like a flat list (it isn’t possible to have a sequence of sequences).

Here is an example:

declare variable $a as xs:string := "red table jet blue ghost hind";  

declare variable $b as xs:string* := tokenize($a, ' ');

And you can verify that $b is a sequence exactly of the wanted strings:

declare variable $a as xs:string := "red table jet blue ghost hind";  

declare variable $b as xs:string* := tokenize($a, ' ');

for $s in $b
  return
    concat('"', $s, '"') 

When the above XQUery code is run, the wanted, correct result is produced:

"red" "table" "jet" "blue" "ghost" "hind"