What XML version to use?

Question

I have an online shop where vendors can upload and import there articles in two formats.

1. plain text (tab delimted)
2. XML

Currently I\'m u

Answer 1

Use version 1.0.

You would only need to use version 1.1 if you are using certain non-ASCII characters in identifiers, EBCDIC line ending characters, or control characters (character codes 1 - 31).

Rationale and list of changes for XML 1.1