Value,Description,Reference
vcdiff,"""vcdiff"" encoding format",[RFC3284]
diffe,"output of the UNIX ""diff -e"" command","[The Open Group.  The Single UNIX Specification,
Version 2 - 6 Vol Set for UNIX 98.  Document number T912,
The Open Group, February 1997.]"
gdiff,GDIFF encoding format,"[Arthur van Hoff and Jonathan Payne.  Generic Diff
Format Specification.  Technical Report NOTE-GDIFF,
World Wide Web Consortium, August 1997.]"
gzip,"Same as the HTTP ""gzip"" content-coding",[RFC2616]
deflate,"Same as the HTTP ""deflate"" content-coding",[RFC2616]
range,result of Range selection,[RFC3229]
identity,no instance-manipulation,[RFC3229]