#data
<item xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://purl.org/rss/1.0/" rdf:about="http://a/" xmlns:hatena="http://www.hatena.ne.jp/info/xmlns#">
  <hatena:imageurl>http://hoga/aa</hatena:imageurl>
</item>
#errors
/item;child element missing;link;m
/item;child element missing;title;m
/item/imageurl;limited use;w

#data
<item xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://purl.org/rss/1.0/" rdf:about="http://a/" xmlns:hatena="http://www.hatena.ne.jp/info/xmlns#">
  <hatena:imageurl>http[]://hoga/aa</hatena:imageurl>
</item>
#errors
/item;child element missing;link;m
/item;child element missing;title;m
/item/imageurl;syntax error:iriref3987;m
/item/imageurl;limited use;w