public static boolean areExpressionsEquivalent(XPathExpression x1, XPathExpression x2) {
        if (x1.getType() != x2.getType()) return false;
        // another hidden and hard-to-find goodie from the dark non-OpenAPI world
        return PsiEquivalenceUtil.areElementsEquivalent(x1, x2);
    }
public static boolean areExpressionsEquivalent(XPathExpression x1, XPathExpression x2)