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我有下面的XML：访问名称空间中的变量在XML使用jQuery
<?xml version='1.0' encoding='UTF-8' ?>
<feed xmlns='http://www.w3.org/2005/Atom' xmlns:media='http://search.yahoo.com/mrss/'
xmlns:openSearch='http://a9.com/-/spec/opensearchrss/1.0/' xmlns:gd='http://schemas.google.com/g/2005'
xmlns:yt='http://gdata.youtube.com/schemas/2007'>
<id>http://gdata.youtube.com/feeds/api/users/djwezleyj/uploads</id>
<updated>2012-03-12T16:22:02.672Z</updated>
<category scheme='http://schemas.google.com/g/2005#kind'
term='http://gdata.youtube.com/schemas/2007#video' />
<title type='text'>Uploads by djwezleyj</title>
<logo>http://www.youtube.com/img/pic_youtubelogo_123x63.gif</logo>
<link rel='related'
type='application/atom+xml' href='https://gdata.youtube.com/feeds/api/users/djwezleyj'
/>
<link rel='alternate' type='text/html' href='https://www.youtube.com/user/djwezleyj/videos'
/>
<link rel='http://schemas.google.com/g/2005#feed' type='application/atom+xml'
href='https://gdata.youtube.com/feeds/api/users/djwezleyj/uploads' />
<link rel='http://schemas.google.com/g/2005#batch' type='application/atom+xml'
href='https://gdata.youtube.com/feeds/api/users/djwezleyj/uploads/batch'
/>
<link rel='self' type='application/atom+xml' href='https://gdata.youtube.com/feeds/api/users/djwezleyj/uploads?start-index=1&max-results=25'
/>
<author>
<name>djwezleyj</name>
<uri>https://gdata.youtube.com/feeds/api/users/djwezleyj</uri>
</author>
<generator version='2.1' uri='http://gdata.youtube.com'>YouTube data API</generator>
<openSearch:totalResults>2</openSearch:totalResults>
<openSearch:startIndex>1</openSearch:startIndex>
<openSearch:itemsPerPage>25</openSearch:itemsPerPage>
<entry>
<id>http://gdata.youtube.com/feeds/api/videos/mr_2Qob4egs</id>
<published>2010-11-29T08:40:45.000Z</published>
<updated>2010-11-29T08:42:38.000Z</updated>
<category scheme='http://schemas.google.com/g/2005#kind'
term='http://gdata.youtube.com/schemas/2007#video' />
<category scheme='http://gdata.youtube.com/schemas/2007/categories.cat'
term='Entertainment' label='Entertainment' />
<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat'
term='Ferry15' />
<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat'
term='plusbanners' />
<title type='text'>Black Hole Tour South Africa.mp4</title>
<content type='text' />
<link rel='alternate' type='text/html' href='https://www.youtube.com/watch?v=mr_2Qob4egs&feature=youtube_gdata'
/>
<link rel='http://gdata.youtube.com/schemas/2007#video.responses' type='application/atom+xml'
href='https://gdata.youtube.com/feeds/api/videos/mr_2Qob4egs/responses'
/>
<link rel='http://gdata.youtube.com/schemas/2007#video.related' type='application/atom+xml'
href='https://gdata.youtube.com/feeds/api/videos/mr_2Qob4egs/related' />
<link rel='http://gdata.youtube.com/schemas/2007#mobile' type='text/html'
href='https://m.youtube.com/details?v=mr_2Qob4egs' />
<link rel='self' type='application/atom+xml' href='https://gdata.youtube.com/feeds/api/users/djwezleyj/uploads/mr_2Qob4egs'
/>
<author>
<name>DJWezleyJ</name>
<uri>https://gdata.youtube.com/feeds/api/users/DJWezleyJ</uri>
</author>
<gd:comments>
<gd:feedLink rel='http://gdata.youtube.com/schemas/2007#comments' href='https://gdata.youtube.com/feeds/api/videos/mr_2Qob4egs/comments'
countHint='0' /></gd:comments>
<media:group>
<media:category label='Entertainment' scheme='http://gdata.youtube.com/schemas/2007/categories.cat'>Entertainment</media:category>
<media:content url='https://www.youtube.com/v/mr_2Qob4egs?version=3&f=user_uploads&app=youtube_gdata'
type='application/x-shockwave-flash' medium='video' isDefault='true' expression='full'
duration='16' yt:format='5' />
<media:content url='rtsp://v7.cache8.c.youtube.com/CigLENy73wIaHwkLeviGQva_mhMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp'
type='video/3gpp' medium='video' expression='full' duration='16' yt:format='1'
/>
<media:content url='rtsp://v4.cache8.c.youtube.com/CigLENy73wIaHwkLeviGQva_mhMYESARFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp'
type='video/3gpp' medium='video' expression='full' duration='16' yt:format='6'
/>
<media:description type='plain' />
<media:keywords>Ferry15, plusbanners</media:keywords>
<media:player url='https://www.youtube.com/watch?v=mr_2Qob4egs&feature=youtube_gdata_player'
/>
<media:thumbnail url='http://i.ytimg.com/vi/mr_2Qob4egs/0.jpg' height='360'
width='480' time='00:00:08' />
<media:thumbnail url='http://i.ytimg.com/vi/mr_2Qob4egs/1.jpg' height='90'
width='120' time='00:00:04' />
<media:thumbnail url='http://i.ytimg.com/vi/mr_2Qob4egs/2.jpg' height='90'
width='120' time='00:00:08' />
<media:thumbnail url='http://i.ytimg.com/vi/mr_2Qob4egs/3.jpg' height='90'
width='120' time='00:00:12' />
<media:title type='plain'>Black Hole Tour South Africa.mp4</media:title>
<yt:duration seconds='16'
/>
</media:group>
<yt:statistics favoriteCount='0' viewCount='169' />
</entry>
<entry>
<id>http://gdata.youtube.com/feeds/api/videos/Nk6JOCqzK18</id>
<published>2009-01-16T08:20:24.000Z</published>
<updated>2010-07-24T02:58:53.000Z</updated>
<category scheme='http://schemas.google.com/g/2005#kind'
term='http://gdata.youtube.com/schemas/2007#video' />
<category scheme='http://gdata.youtube.com/schemas/2007/categories.cat'
term='Entertainment' label='Entertainment' />
<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat'
term='54827575663' />
<category scheme='http://gdata.youtube.com/schemas/2007/keywords.cat'
term='30710' />
<title type='text'>The Renegade DJs at Club Traxx - 12 December 2008</title>
<content type='text'>http://www.facebook.com/group.php?gid=6763068443&ref=ts For more info
on the Renegades</content>
<link rel='alternate' type='text/html' href='https://www.youtube.com/watch?v=Nk6JOCqzK18&feature=youtube_gdata'
/>
<link rel='http://gdata.youtube.com/schemas/2007#video.responses' type='application/atom+xml'
href='https://gdata.youtube.com/feeds/api/videos/Nk6JOCqzK18/responses'
/>
<link rel='http://gdata.youtube.com/schemas/2007#video.related' type='application/atom+xml'
href='https://gdata.youtube.com/feeds/api/videos/Nk6JOCqzK18/related' />
<link rel='self' type='application/atom+xml' href='https://gdata.youtube.com/feeds/api/users/djwezleyj/uploads/Nk6JOCqzK18'
/>
<author>
<name>DJWezleyJ</name>
<uri>https://gdata.youtube.com/feeds/api/users/DJWezleyJ</uri>
</author>
<gd:comments>
<gd:feedLink rel='http://gdata.youtube.com/schemas/2007#comments' href='https://gdata.youtube.com/feeds/api/videos/Nk6JOCqzK18/comments'
countHint='0' /></gd:comments>
<media:group>
<media:category label='Entertainment' scheme='http://gdata.youtube.com/schemas/2007/categories.cat'>Entertainment</media:category>
<media:content url='https://www.youtube.com/v/Nk6JOCqzK18?version=3&f=user_uploads&app=youtube_gdata'
type='application/x-shockwave-flash' medium='video' isDefault='true' expression='full'
duration='113' yt:format='5' />
<media:content url='rtsp://v5.cache3.c.youtube.com/CigLENy73wIaHwlfK7MqOIlONhMYDSANFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp'
type='video/3gpp' medium='video' expression='full' duration='113' yt:format='1'
/>
<media:content url='rtsp://v2.cache7.c.youtube.com/CigLENy73wIaHwlfK7MqOIlONhMYESARFEgGUgx1c2VyX3VwbG9hZHMM/0/0/0/video.3gp'
type='video/3gpp' medium='video' expression='full' duration='113' yt:format='6'
/>
<media:description type='plain'>http://www.facebook.com/group.php?gid=6763068443&ref=ts For more info
on the Renegades</media:description>
<media:keywords>54827575663, 30710</media:keywords>
<media:player url='https://www.youtube.com/watch?v=Nk6JOCqzK18&feature=youtube_gdata_player'
/>
<media:thumbnail url='http://i.ytimg.com/vi/Nk6JOCqzK18/0.jpg' height='360'
width='480' time='00:00:56.500' />
<media:thumbnail url='http://i.ytimg.com/vi/Nk6JOCqzK18/1.jpg' height='90'
width='120' time='00:00:28.250' />
<media:thumbnail url='http://i.ytimg.com/vi/Nk6JOCqzK18/2.jpg' height='90'
width='120' time='00:00:56.500' />
<media:thumbnail url='http://i.ytimg.com/vi/Nk6JOCqzK18/3.jpg' height='90'
width='120' time='00:01:24.750' />
<media:title type='plain'>The Renegade DJs at Club Traxx - 12 December 2008</media:title>
<yt:duration
seconds='113' />
</media:group>
<gd:rating average='5.0' max='5' min='1' numRaters='1' rel='http://schemas.google.com/g/2005#overall'
/>
<yt:statistics favoriteCount='0' viewCount='106' />
</entry>
</feed>
我有困难访问（每个 “输入” 实例内）以下变量
- 内容
- 媒体：组---->媒体：描述
我用来返回JSON对象的代码来自该你管API是：
<script type="text/javascript">
var playListURL = 'https://gdata.youtube.com/feeds/api/users/djwezleyj/uploads?v=2&alt=json&callback=?';
var videoURL= 'http://www.youtube.com/watch?v=';
$.getJSON(playListURL, function(data) {
var list_data="";
$.each(data.feed.entry, function(i, item) {
var feedTitle = item.title.$t;
var content = item.content.$t;
var feedURL = item.link[1].href;
var fragments = feedURL.split("/");
var videoID = fragments[fragments.length - 2];
var url = videoURL + videoID;
var thumb = "http://img.youtube.com/vi/"+ videoID +"/default.jpg";
list_data += '<li><a href="'+ url +'" title="'+ feedTitle +'"><img alt="'+ feedTitle+'" src="'+ thumb +'"/></a><div>'+ feedTitle + '<br>' + content + '</div></li>';
});
$(list_data).appendTo(".cont");
});
</script>
内容变量返回为“未定义”
另外，我还没有得到任何运气访问在媒体namepace变量：集团命名空间
任何关于如何解决这个问题的想法？
在此先感谢