RFC 6129 (http://tools.ietf.org/html/rfc6129), which establishes the application/tei+xml media type, has this rather egregious error in its first paragraph:
" This document defines the 'application/tei+xml' media type for markup
languages defined in accordance with the Text Encoding and
Should be "Text Encoding Initiative". I'm assigning this to Laurent, since he's one of the original authors.