XQuery：计算函数的自变量

declare function local:helloWorld($param1 as xs:string, $param2 as xs:string)  as element() {

import module namespace sctx = \"http://www.zorba-xquery.com/modules/introspection/sctx\";

declare function local:helloWorld($param1 as xs:string, $param2 as xs:string)  as xs:string {
  fn:concat($param1, $param2)
};

sctx:function-arguments-count(xs:QName(\"local:helloWorld\"))