Error: XML document structures must start and end within the same entity

Your XML is not well-formed. In general, this error indicates that something is wrong with the range of the start and end tags.

In particular in your case, you have a stray s in one of the closing access2 tags:

    <access2>115AL<s/access2>

Here is your XML with the problem resolved; it is now well-formed (and indented to improve readability):

<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
  <test>
    <access1>113AL</access1>
    <access2>119AL</access2>
  </test>
  <test>
    <access2>115AL</access2>
    <access3>116AL</access3>
  </test>
  <test>
    <access4>118AL</access4>
    <access5>119AL</access5>
  </test>
  <copies>
    <test2>
      <access>113AL</access>
      <Copy>Y</Copy>
    </test2>
    <test2>
      <access>113AX</access>
      <Copy>N</Copy>
    </test2>
  </copies>
</root>