Rich text
{
    " text/plain; ": "",
    "text/uri-list; ": "http://www.apple.com/",
    "text/html; ": "<b style='color: green'></b>",
    "\fcustom type\r": "custom data"
}
{
    "\tText": "",
    "\r\nURL": "http://www.apple.com/",
    "    text/html;charset=utf-8 ": "<b style='color: green'></b>",
    " custom type\t\n": "custom data"
}