#rss2
#data
<channel xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd">
  <itunes:author>aa</itunes:author>
</channel>
#errors
channel;child element missing;description;m
channel;child element missing;link;m
channel;child element missing;title;m

#rss2
#data
<channel xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd">
  <itunes:author>aa</itunes:author>
  <itunes:author>aa</itunes:author>
</channel>
#errors
channel;child element missing;description;m
channel;child element missing;link;m
channel;child element missing;title;m
channel/author;element not allowed:duplicate;m

#rss2
#data
<channel xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd">
  <itunes:image />
</channel>
#errors
channel;child element missing;description;m
channel;child element missing;link;m
channel;child element missing;title;m
channel/image;attribute missing;href;m

#rss2
#data
<channel xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd">
  <itunes:image href="http://x/"/>
</channel>
#errors
channel;child element missing;description;m
channel;child element missing;link;m
channel;child element missing;title;m

#rss2
#data
<channel xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd">
  <itunes:image href="http:[]//x/"/>
</channel>
#errors
channel;child element missing;description;m
channel;child element missing;link;m
channel;child element missing;title;m
channel/image/@href;syntax error:iriref3987;m

#rss2
#data
<channel xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd">
  <itunes:image href="http://x/"/>
  <itunes:image href="http://x/"/>
</channel>
#errors
channel;child element missing;description;m
channel;child element missing;link;m
channel;child element missing;title;m
channel/image;element not allowed:duplicate;m