string UpSong::didl()

{

    ostringstream ss;

    string typetag;

    if (iscontainer) {

  typetag = "container";

    } else {

  typetag = "item";

    }

    ss << "<" << typetag << " id=\"" << id << "\" parentID=\"" <<

  parentid << "\" restricted=\"1\" searchable=\"" <<

  (searchable ? string("1") : string("0")) << "\">" <<

  "<dc:title>" << SoapHelp::xmlQuote(title) << "</dc:title>";

    if (iscontainer) {

  ss << "<upnp:class>object.container</upnp:class>" <<

      (artist.empty() ? string() :

       string("<upnp:userAnnotation>" + SoapHelp::xmlQuote(artist) +

          "</upnp:userAnnotation>"));

    } else {

  ss << "<upnp:class>object.item.audioItem.musicTrack</upnp:class>";

#define UPNPXML(FLD, TAG)                    \

  if (!FLD.empty()) {                    \

      ss << "<" #TAG ">" << SoapHelp::xmlQuote(FLD) <<   \

      "</" #TAG ">";                     \

  }

  UPNPXML(uri, uri);

  UPNPXML(artist, dc:creator);

  UPNPXML(artist, upnp:artist);

  UPNPXML(genre, upnp:genre);

  UPNPXML(tracknum, upnp:originalTrackNumber);

  UPNPXML(artUri, upnp:albumArtURI);

  ss << "<res " << "duration=\"" <<

      upnpduration(duration_secs * 1000)  << "\" " <<

      "sampleFrequency=\"44100\" audioChannels=\"2\" " <<

      "protocolInfo=\"http-get:*:audio/mpeg:*\">" <<

      SoapHelp::xmlQuote(uri) <<

      "</res>";

    }

    ss << "</" << typetag << ">";

    return ss.str();

}

const string& headDIDL()

{

    static const string head(

  "<?xml version=\"1.0\" encoding=\"utf-8\"?>"

  "<DIDL-Lite xmlns:dc=\"http://purl.org/dc/elements/1.1/\" "

  "xmlns:upnp=\"urn:schemas-upnp-org:metadata-1-0/upnp/\" "

  "xmlns=\"urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/\" "

  "xmlns:dlna=\"urn:schemas-dlna-org:metadata-1-0/\">");

    return head;

}

const string& tailDIDL()

{

    static const string tail("</DIDL-Lite>");

    return tail;

}

string wrapDIDL(const std::string& data)

{

    return headDIDL() + data + tailDIDL();

}