xmlxpathxpath-3.0

Let expression for multiple variables in XPath 3.0


I want to declare 2-3 variables using a function let and run a separate loop for for each variable. How can i do this?

I can use only XPath 3.0.

Thanks in advance.

I tried expressions like this, but they don't work: 1) let $x := a, $y := b return (for $var1 in $x return expr1), (for $var2 in $y return expr2)

  1. return (for $var1 in $x return expr1, for $var2 in $y return expr2)

  2. return for $var1 in $x return expr1, for $var2 in $y return expr2


Solution

  • The syntax in XPath 3.0 is

    [11]    LetExpr    ::=      
              SimpleLetClause "return" ExprSingle
    [12]    SimpleLetClause    ::=      
              "let" SimpleLetBinding ("," SimpleLetBinding)*
    [13]    SimpleLetBinding   ::=      
              "$" VarName ":=" ExprSingle
    

    I believe that the construct:

    let $x := a, $y := b 
    return (for $var1 in $x return expr1, for $var2 in $y return expr2)
    

    should work, though I don't have an XPath 3.0 processor to try it on. It's certainly working in XPath 3.1.