#data
<p xmlns="http://www.w3.org/1999/xhtml"
  id="abc"
>a</p>
#errors

#data
<p xmlns=""
  id="abc"
>a</p>
#errors
/p;unknown namespace element;u

#data
<p xmlns=""
  id="abc"
><q id="abc"/>a</p>
#errors
/p;unknown namespace element;u
/p/q;unknown namespace element;u
/p/q/@id;duplicate ID;m

#data
<p xmlns="http://www.w3.org/1999/xhtml"
  id="abc"
><q id="abc" xmlns=""/>a</p>
#errors
/p/q;unknown namespace element;u
/p/q/@id;duplicate ID;m
/p/q;element not allowed:phrasing;m

#data
<title xmlns="http://www.w3.org/2005/Atom"
    id="ab"
    type="xhtml"
  >
  <div xmlns="http://www.w3.org/1999/xhtml">
    <p id="ab">aaa</p>
  </div>
</title>
#errors
/title/@id;attribute not defined;m
/title/div/p/@id;duplicate ID;m

#rss2
#data
<description id="foo">a</description>
#errors
description/@id;attribute not defined;m

#rss2
#data
<description id="">a</description>
#errors
description/@id;attribute not defined;m
description/@id;empty attribute value;m