public static Quantifier getQuantifierImpl(PsiElement element) {
    PsiElement nextSibling = element.getNextSibling();
    while (nextSibling instanceof PsiWhiteSpace) {
      nextSibling = nextSibling.getNextSibling();
    }

    if (nextSibling instanceof XmlToken) {
      IElementType tokenType = ((XmlToken)nextSibling).getTokenType();
      if (tokenType == XML_PLUS) {
        return Quantifier.ONE_OR_MORE;
      }
      else if (tokenType == XML_STAR) {
        return Quantifier.ZERO_OR_MORE;
      }
      else if (tokenType == XML_QUESTION) {
        return Quantifier.OPTIONAL;
      }
    }
    return Quantifier.REQUIRED;
  }
public static Quantifier getQuantifierImpl(PsiElement element)