input: from typing import List
  
  def construct_xml_document(items: List[str]) -> str:
      """ Construct an XML document using Python which contains a list of items.
      Each item will be a child of the 'data' element.
      For example:
      >>> construct_xml_document(['Item1', 'Item2', 'Item3'])
      '<data><item>Item1</item><item>Item2</item><item>Item3</item></data>'
      """
output:     xml_content = "<data>"
      for item in items:
          xml_content += f"<item>{item}</item>"
      xml_content += "</data>"
      return xml_content