The +exi Media Type Suffix
Zach Shelby, Olaf Bergmann, Carsten Bormann · 2017
Efficient XML Interchange (EXI) is an XML representation technique specified by the W3C to provide a time and space efficient encoding for XML documents. This document defines a new Structured Syntax Suffix +exi for use in a specific class of protocols, where exi content-type encoding or the generic application/exi media type are not applicable.