@NotNull
  @Override
  public XPathElementType getOperator() {
    final ASTNode node = getNode().findChildByType(XPathTokenTypes.ADD_OPS);
    final XPathElementType elementType = (XPathElementType)(node != null ? node.getElementType() : null);
    assert elementType != null : unexpectedPsiAssertion();
    return elementType;
  }
@NotNull
  @Override
  public XPathElementType getOperator()