XmlFile:test.xml
  PsiElement(XML_DOCUMENT)
    PsiElement(XML_PROLOG)
      <empty list>
    XmlTag:a
      XmlToken:XML_START_TAG_START('<')
      XmlToken:XML_NAME('a')
      XmlToken:XML_TAG_END('>')
      PsiElement(XML_COMMENT)
        XmlToken:XML_COMMENT_START('<!--')
        XmlToken:XML_COMMENT_CHARACTERS('<b>')
        XmlToken:XML_COMMENT_END('-->')
      XmlToken:XML_END_TAG_START('</')
      XmlToken:XML_NAME('a')
      XmlToken:XML_TAG_END('>')