fn.functionLookupfn.functionlookupfnfunctionlookup/apidoc/8.0/fn:function-lookup.xml
Returns a function with the given name and arity, or the empty sequence if
none exists.
For more details, see
XPath 3.0 Functions and Operators.
The QName of the function.
namexs.QName
The number of arguments the function takes.
arityNumberfunction(*)?
var fn = fn.functionLookup(fn.QName("http://www.w3.org/2005/xpath-functions","concat"),4);
xdmp.functionSignature(fn);
=> "function(xs:anyAtomicType?, xs:anyAtomicType?, xs:anyAtomicType?, xs:anyAtomicType?) as xs:string"