import-and-process.xq
import module namespace acs = 'http://whatever.net' at 'lib.xqm';
declare variable $filename external;

acs:import-and-process($filename)

import-all.xq
import module namespace acs = 'http://whatever.net' at 'lib.xqm';
declare variable $dir external;

(:
 : for-each(file:list($dir, xs:boolean("false"), "*.xml"), acs:import-and-process(?))
 :)

for $file in file:list($dir, xs:boolean("false"), "*.xml")
return acs:import-and-process(file:current-dir() || $dir || '\' || $file)

lib.xqm
module namespace acs = 'http://whatever.net';

declare function acs:hello($world) {
	'Hello' || $world
	};

declare updating function acs:import-and-process($filename) {
(: find timestamp in filename :)
(: get package and file into variables :)
let $mydoc    := doc($filename)
let $datetime := file:last-modified($filename)
let $package  := substring-before($mydoc/testrun/testsuite/@name/data(), ".")
let $file     := substring-after($mydoc/testrun/testsuite/@name/data(), ".")
let $testrun  := file:name($filename)

(: add file to database :)
(: insert package, file, and timestamp attributes to every testcase :)
return
	copy $mycopy := $mydoc
  modify (for $testcase in $mycopy//testcase
					return insert nodes
                  (attribute package {$package},
                   attribute file {$file},
                   attribute xs:datetime {$datetime},
									 attribute testrun {$testrun})
									 into $testcase)
   return
	 (db:replace("TestResults", file:name($filename), $mycopy)),
   (db:flush("TestResults"))
};

basex -i TestResults -b dir=TestResults import-all.xq
: Updates are not written back.