When and Why is XML preferable to CSV?

sometimes it feels like XML has been used just because it was fashionable.

Some strengths:

• You can validate XML data against XSD
• You can easily provide contracts (as XSD) to other parties that should either create/consume XML data, without literally describing them
• You can have one to many relations in multi-levels in XML data representation
• XML is arguably more readable than CSV
• XML is natively supported by the .net framework

To name a few from the top of my head.