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   [error as xs.QName?],
   [description as String],
   [data as Sequence]
) as null


[1.0 and 1.0-ml only, 0.9-ml has a different signature] Throw the given error. When an error is thrown, the XQuery program execution is stopped. For detailed semantics, see http://www.w3.org/TR/xpath-functions/#func-error.

error Error code, as an xs:QName. Note that this parameter does not exist in 0.9-ml.
description String description to be printed with the error.
data Parameters to the error message.


var x = xdmp.random(100);
var res = new Array();
if ( x > 50 ) { 
  fn.error(xs.QName("ERROR"), "greater than 50") }
else { res.push("Less than or equal to 50") };
res.push(": no error was thrown");
fn.concat(res[0], res[1]);

=> The error when the random number is greater
   than 50, otherwise a string.

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