What XML is
XML marks up data with nested named tags and optional attributes. It is verbose, strict about being well-formed, and can carry a schema that says what shape a document must have.
Enterprise integrations, government data feeds, RSS, SOAP services and older document formats.
What Plain Text is
Plain text here means columns lined up with spaces, the way a command line tool prints a table.
Terminal output, log files, fixed-width exports from older systems.
What changes when you convert XML to Plain Text
The first repeating element is treated as the rows. Attributes are read alongside child elements and prefixed so they do not collide with a same-named tag. Nesting one level deep becomes dotted column names; deeper structures are kept as text.
Columns are padded to the widest value. Width is counted in display columns rather than characters, so a table containing Chinese, Japanese or Korean text still lines up: those glyphs occupy two columns in a monospace font.
What carries over from XML to Plain Text
XML records 3 things about a table that plain text has no way to hold.
An empty cell and a missing one are the same thing in plain text, so a null and an empty string in the XML both come out blank and can no longer be told apart.
XML can hold a value that is itself a list or an object. plain text has only flat cells, so nested values are flattened into one cell rather than being spread across columns.
A line break inside a cell ends the row in plain text, so line breaks are replaced rather than carried through.
The keys stop being repeated: plain text writes the column names once at the top, so the same table takes noticeably less space.
The identifier 007 comes out of the Plain Text as 007. Reading it as a number would have made it 7, and an id that changes value is worse than one that stays text.
The role "Analyst, data" survives with its comma, in one cell rather than split across two. That is the first thing to check in any converted table, and the usual place a Plain Text file goes wrong.
The quotes around Jonah "Jo" Pryce are left as a plain quote character in the Plain Text.