CDuce: XML-oriented functional language(cduce.org)

    declare function local:make-dynamic-element-node(
      $name as xs:QName,
      $attributes as map(*),
      $contents as item()*) 
    as element(Q{http://example.org/ns/joecool}joecool) 
    {
      element { $name } {
        map:for-each($attributes, function($key, $value) {
          attribute { $key } { $value }
      })
      , $contents
      }
    };
    
    declare function local:make-literal-element-node(
      $foo as xs:string?,
      $bar as xs:string?
    )
    as element() 
    {
      <joecool xmlns="http://example.org/ns/joecool" foo="{$foo}" moo="{$bar}">lorem ipsum</joecool>
    };
    
    
    let $at := map{
      "foo": "bar"
    , "moo": "test"
    }
    return (
             local:make-dynamic-element-node(QName("http://example.org/ns/joecool", "joecool"), $at, "lorem ipsum")
           , local:make-literal-element-node("value1","value2")
           )
    
    Result:
    
    <joecool xmlns="http://example.org/ns/joecool" foo="bar" moo="test">lorem ipsum</joecool>
    <joecool xmlns="http://example.org/ns/joecool" foo="value1" moo="value2">lorem ipsum</joecool>