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('>')
      XmlText
        PsiWhiteSpace(' ')
        PsiErrorElement:Unescaped & or nonterminated character/entity reference
          XmlToken:XML_BAD_CHARACTER('&')
        XmlToken:XML_DATA_CHARACTERS('n')
        PsiWhiteSpace(' ')
      XmlToken:XML_END_TAG_START('</')
      XmlToken:XML_NAME('a')
      XmlToken:XML_TAG_END('>')