xmllite is unable to write a backspace character

I am using xmllite to write xml in the form of a DataSet
The data contains a backspace character
If I write it with the dataset itself, it writes this
    <VALUE>DEFAULT@/Default/&#x8;/Default=2/</VALUE>

I am escaping it this way
        case '\b':  StrCatW(m_unicodeBuff, L"&#x8;");       break;

the xml written by xmllite is this
        <VALUE>DEFAULT@/Default/&amp;/Default=2/</VALUE>

how can I get xmllite to encode the backspace character?