def parse(raw):
        "Returns tuple of (session-id (str), capabilities (Capabilities)"
        sid, capabilities = 0, []
        root = to_ele(raw)
        for child in root.getchildren():
            if child.tag == qualify("session-id") or child.tag == "session-id":
                sid = child.text
            elif child.tag == qualify("capabilities") or child.tag == "capabilities" :
                for cap in child.getchildren():
                    if cap.tag == qualify("capability") or cap.tag == "capability":
                        capabilities.append(cap.text)
        return sid, Capabilities(capabilities)
Returns tuple of (session-id (str), capabilities (Capabilities)