使用touchXML解析``RSS提要标签

I have the following RSS feed that I'm trying to parse using touchXML for an iphone application.

我有以下RSS源,我正在尝试使用touchXML解析iphone应用程序。

<rss version="2.0" xmlns:media="http://search.yahoo.com/mrss/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:ext="http://ooyala.com/syndication/ext/" xmlns:mediasl="http://www.slide.com/funspace/developer/" xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" xmlns:boxee="http://boxee.tv/spec/rss/"> 
<channel> 
    <title>Channel Title</title> 
    <description>Channel Description</description> 
    <link>link</link> 
    <item> 
        <title>title</title> 
        <guid isPermaLink="false">k2dDRpMTpto4kdpU_NhGmNGKRK0Ny0PH</guid> 
        <pubDate>Fri, 25 Jun 2010 06:53:48 +0000</pubDate> 
        <media:title>title</media:title> 
        <media:keywords>Others</media:keywords> 
        <media:category scheme="http://www.ooyala.com">/JBay10</media:category> 
        <media:category scheme="http://www.ooyala.com">/JBay10/Webisodes</media:category> 
        <media:thumbnail url="http://ak.c.ooyala.com/k2dDRpMTpto4kdpU_NhGmNGKRK0Ny0PH/BqcWmm1bH0zjWgL35lMDoxOjBrO7OBB8" width="640" height="360"/> 
        <dcterms:valid>start=2010-06-25T06:53+00:00;scheme=W3C-DTF</dcterms:valid> 
        <media:group> 
            <media:content url="http://api.ooyala.com/syndication/stream_redirect?pcode=N2d2U6Azh1SxAcZeoJia-srBQAtY&amp;expires=1277743230&amp;streamID=2678810&amp;signature=beZ2o45XNredayqbtIzzL7khsnt1EEjwByf0yMgSEv8&amp;size=20985109&amp;length=163280" type="video/mp4" medium="video" expression="full" bitrate="900" framerate="25.0" samplingrate="32.0" duration="163" lang="en"/> 
        </media:group>
    </item>
    ...
</channel>

The problem I'm having is that I cannot access the <media:...> tags especially the url at <media:content>. The code I'm using the following method to parse the rss feed.

我遇到的问题是我无法访问 <...>

<

<>

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