MarkLogic Server 11.0 Product Documentationfn:function-lookup
fn:function-lookup( $name as xs:QName, $arity as xs:integer ) as function(*)?
Summary
Returns a function with the given name and arity, or the empty sequence if none exists. You can use the returned function reference with xdmp:apply. For more details, see XPath 3.0 Functions and Operators.
| Parameters | |
|---|---|
| name | The QName of the function. |
| arity | The number of arguments the function takes. |
Example
let $fn := fn:function-lookup(fn:QName("http://www.w3.org/2005/xpath-functions","concat"),4)
return
xdmp:function-signature($fn)
=> "function(xs:anyAtomicType?, xs:anyAtomicType?, xs:anyAtomicType?, xs:anyAtomicType?) as xs:string"
Example
let $fn := fn:function-lookup(
fn:QName("http://www.w3.org/2005/xpath-functions","concat"),4)
return
xdmp:apply($fn, "here", "is", "an", "example")
==> "hereisanexample"