web testing - Understand the XXE injection payload? -

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i know xxe, want know basic format of basic payload, , want understand in simple language, can me,

?xml version="1.0" encoding="iso-8859-1"?

!doctype foo

!element foo

!entity xxe system "file:///etc/passwd" ] foo&xxe;/foo

i know function of lowest part, want know above 1 doctype , element one,

will big help,

thank you





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