The EXI Working Group has published Canonical EXI as a W3C Recommendation. The EXI 1.0 format specifies the syntax of a class of resources called EXI streams. It is possible for EXI streams that are equivalent for the purposes of many applications to differ in physical representation. The Canonical EXI Recommendation specifies a method to get a canonical form, to be used with digital signatures. Even restricted and very limited devices should be able to create or check a canonical EXI stream. This applies to devices that may be able to speak only a given language (according to an XML Schema) or support only a subset of all EXI features.