XPath - Получите узел без ребенка определенного типа

/**
 * Returns the amount of free memory.
 * @return {@code long} - Free space.
 */
public long getFreeInternalMemory() {
    return getFreeMemory(Environment.getDataDirectory());
}

/**
 * Returns the free amount in SDCARD.
 * @return {@code long} - Free space.
 */
public long getFreeExternalMemory() {
    return getFreeMemory(Environment.getExternalStorageDirectory());
}

/**
 * Returns the free amount in OS.
 * @return {@code long} - Free space.
 */
public long getFreeSystemMemory() {
    return getFreeMemory(Environment.getRootDirectory());
}

/**
 * Returns the free amount in mounted path
 * @param path {@link File} - Mounted path.
 * @return {@code long} - Free space.
 */
public long getFreeMemory(File path) {
    if ((null != path) && (path.exists()) && (path.isDirectory())) {
        StatFs stats = new StatFs(path.getAbsolutePath());
        return stats.getAvailableBlocksLong() * stats.getBlockSizeLong();
    }
    return -1;
}

/**
 * Convert bytes to human format.
 * @param totalBytes {@code long} - Total of bytes.
 * @return {@link String} - Converted size.
 */
public String bytesToHuman(long totalBytes) {
    String[] simbols = new String[] {"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
    long scale = 1L;
    for (String simbol : simbols) {
        if (totalBytes < (scale * 1024L)) {
            return String.format("%s %s", new DecimalFormat("#.##").format((double)totalBytes / scale), simbol);
        }
        scale *= 1024L;
    }
    return "-1 B";
}