#data
<meta property="og:title" content="hoge" xmlns="http://www.w3.org/1999/xhtml"/>
#errors
/meta/@property;ogp:missing prop;og:type;m

#data
<meta property="og:type" content="hoge" xmlns="http://www.w3.org/1999/xhtml"/>
#errors
/meta/@property;ogp:missing prop;og:title;m
/meta/@content;ogp:og:type:bad value;m

#data
<meta property="og:type" xmlns="http://www.w3.org/1999/xhtml"/>
#errors
/meta/@property;ogp:missing prop;og:title;m
/meta;attribute missing;content;m

#data
<meta property="og:type" content="hoge" name="keywords" xmlns="http://www.w3.org/1999/xhtml"/>
#errors
/meta/@property;ogp:missing prop;og:title;m
/meta/@content;ogp:og:type:bad value;m
/meta/@property;attribute not allowed;m

#data
<meta property="og:title" content="text/html; charset=utf-8" http-equiv="content-type" xmlns="http://www.w3.org/1999/xhtml"/>
#errors
/meta/@property;ogp:missing prop;og:type;m
/meta/@property;attribute not allowed;m
/meta/@content;in XML:charset;m

#data
<meta property="og:title" content="hoge" charset="utf-8" xmlns="http://www.w3.org/1999/xhtml"/>
#errors
/meta/@property;ogp:missing prop;og:type;m
/meta/@property;attribute not allowed;m

#data
<meta property="og:title" content="hoge" itemprop="utf-8" xmlns="http://www.w3.org/1999/xhtml"/>
#errors
/meta/@property;ogp:missing prop;og:type;m
/meta/@property;attribute not allowed;m
/meta;microdata:unused itemprop;m

#data
<meta property="og:title" content="hoge" xmlns="http://www.w3.org/1999/xhtml">
</meta>
#errors
/meta/@property;ogp:missing prop;og:type;m

#data
<meta property="og:title" content="hoge" xmlns="http://www.w3.org/1999/xhtml">abc</meta>
#errors
/meta/@property;ogp:missing prop;og:type;m
/meta/"abc";character not allowed:empty;m

#data
<meta property="og:title" content="hoge" xmlns="http://www.w3.org/1999/xhtml"><p>abc</p></meta>
#errors
/meta/@property;ogp:missing prop;og:type;m
/meta/p;element not allowed:empty;m

#data
<meta property="article:modified_time" content="hoge" xmlns="http://www.w3.org/1999/xhtml"/>
#errors
/meta/@content;datetime:syntax error;m
/meta/@property;ogp:missing prop;og:type;m
/meta/@property;ogp:missing prop;og:title;m
/meta/@property;ogp:prop:bad og:type;article;m
/meta/@content;datetime:lowercase designator;w

#data
<meta property="article:modified_time" content="2012-01-21"
    xmlns="http://www.w3.org/1999/xhtml"/>
#errors
/meta/@property;ogp:missing prop;og:type;m
/meta/@property;ogp:missing prop;og:title;m
/meta/@property;ogp:prop:bad og:type;article;m

#data
<meta property="article:modified_time" content="2012-01-12T00:12:22Z"
    xmlns="http://www.w3.org/1999/xhtml"/>
#errors
/meta/@content;datetime:syntax error;m
/meta/@property;ogp:missing prop;og:type;m
/meta/@property;ogp:missing prop;og:title;m
/meta/@property;ogp:prop:bad og:type;article;m

#data
<meta property="article:modified_time" content="2012-01-12T00:12:22"
    xmlns="http://www.w3.org/1999/xhtml"/>
#errors
/meta/@content;datetime:syntax error;m
/meta/@property;ogp:missing prop;og:type;m
/meta/@property;ogp:missing prop;og:title;m
/meta/@property;ogp:prop:bad og:type;article;m

#data
<meta property="article:modified_time" content="2012-01-12T00:12"
    xmlns="http://www.w3.org/1999/xhtml"/>
#errors
/meta/@property;ogp:missing prop;og:type;m
/meta/@property;ogp:missing prop;og:title;m
/meta/@property;ogp:prop:bad og:type;article;m

#data
<meta property="article:modified_time" content="-2012-01-12T00:12"
    xmlns="http://www.w3.org/1999/xhtml"/>
#errors
/meta/@property;ogp:missing prop;og:type;m
/meta/@property;ogp:missing prop;og:title;m
/meta/@property;ogp:prop:bad og:type;article;m
/meta/@content;datetime:expanded year;w
/meta/@content;datetime:pre-gregorio year;w