input: 
  def parse_xml(text):
      """
      Parse an XML document and return a list of tag objects.
      Each Tag object should have an attribute 'tag_id' corresponding to the 'id' attribute
      of the parent tag in the XML, and a list of values corresponding to the 'value' attributes
      of its child tags.
      Example:
      For the input:
      <xml>
        <root>
          <child1 id="1">
            <subchild1 value="a">
            </subchild1>
            <subchild2 value="b">
            </subchild2>
          </child1>
          <child2 id="2">
            <subchild3 value="c">
            </subchild3>
            <subchild4 value="d">
            </subchild4>
          </child2>
        </root>
      </xml>
      The output should be a list of Tag objects:
      [Tag(tag_id='1', values=['a', 'b']), Tag(tag_id='2', values=['c', 'd'])]
      """
      tag_objects = []
  
      root = ET.fromstring(text)
      for child in root:
          tag = Tag(child.attrib["id"])
          for subchild in child:
              tag.add_value(subchild.attrib["value"])
          tag_objects.append(tag)
  
      return tag_objects
  
  class Tag:
      def __init__(self, tag_id):
          self.tag_id = tag_id
          self.values = []
      
      def add_value(self, value):
          self.values.append(value)
  
output:     
  import xml.etree.ElementTree as ET
  
  def parse_xml(text):
      """
      Parse an XML document and return a list of tag objects.
      Each Tag object should have an attribute 'tag_id' corresponding to the 'id' attribute
      of the parent tag in the XML, and a list of values corresponding to the 'value' attributes
      of its child tags.
      Example:
      For the input:
      <xml>
        <root>
          <child1 id="1">
            <subchild1 value="a">
            </subchild1>
            <subchild2 value="b">
            </subchild2>
          </child1>
          <child2 id="2">
            <subchild3 value="c">
            </subchild3>
            <subchild4 value="d">
            </subchild4>
          </child2>
        </root>
      </xml>
      The output should be a list of Tag objects:
      [Tag(tag_id='1', values=['a', 'b']), Tag(tag_id='2', values=['c', 'd'])]
      """
      tag_objects = []
  
      root = ET.fromstring(text)
      for child in root:
          tag = Tag(child.attrib["id"])
          for subchild in child:
              tag.add_value(subchild.attrib["value"])
          tag_objects.append(tag)
  
      return tag_objects
  
  class Tag:
      def __init__(self, tag_id):
          self.tag_id = tag_id
          self.values = []
      
      def add_value(self, value):
          self.values.append(value)
  