private async Task ParseMediaEntry(string mediaEntryString, PicasaPostImage postImage)
        {
            postImage.srcUrl = null;

            // First try <content src>
            var xmlDoc = new Windows.Data.Xml.Dom.XmlDocument();

            xmlDoc.LoadXml(mediaEntryString);
            var contentEl = xmlDoc.SelectSingleNodeNS("/atom:entry/atom:content", _nsMgr.ToNSMethodFormat());

            if (contentEl != null)
            {
                postImage.srcUrl = XmlHelper.GetUrl(contentEl, "@src", _nsMgr, null);
            }

            // Then try media RSS
            if (postImage.srcUrl == null || postImage.srcUrl.Length == 0)
            {
                contentEl = xmlDoc.SelectSingleNodeNS("/atom:entry/media:group/media:content[@medium='image']", _nsMgr.ToNSMethodFormat());
                if (contentEl == null)
                {
                    throw new ArgumentException("Picasa photo entry was missing content element");
                }
                postImage.srcUrl = XmlHelper.GetUrl(contentEl, "@url", _nsMgr, null);
            }

            postImage.editUri = AtomEntry.GetLink(xmlDoc.SelectSingleNodeNS("/atom:entry", _nsMgr.ToNSMethodFormat()), _nsMgr, "edit-media", null, null, null);
        }
        protected virtual void ParseResponse(XmlDocument xmlDoc, PostNewImageResult result)
        {
            XmlElement contentEl = xmlDoc.SelectSingleNodeNS("/atom:entry/atom:content", _nsMgr.ToNSMethodFormat()) as XmlElement;

            result.srcUrl  = XmlHelper.GetUrl(contentEl, "@src", null);
            result.editUri = AtomEntry.GetLink(xmlDoc.SelectSingleNodeNS("/atom:entry", _nsMgr.ToNSMethodFormat()) as XmlElement, _nsMgr, "edit-media",
                                               null, null, null);
            result.editEntryUri = AtomEntry.GetLink(xmlDoc.SelectSingleNodeNS("/atom:entry", _nsMgr.ToNSMethodFormat()) as XmlElement, _nsMgr, "edit",
                                                    null, null, null);
            result.selfPage = AtomEntry.GetLink(xmlDoc.SelectSingleNodeNS("/atom:entry", _nsMgr.ToNSMethodFormat()) as XmlElement, _nsMgr, "alternate",
                                                null, null, null);
        }