\definetextposition[name][settings]
# \definetextvariable[settings][???][???]
\definetype[name][settings]
# \definetypeface
\definetyping[file|typing|name][settings]
\defineversion[name][numbers]
# \defineXMLargument
# \defineXMLcommand
# \defineXMLenvironment
# \defineXMLenvironmentsave
\RCSRevision which would expand to
just 1.4. It's probably quote simple, but would require research (I
have but merely scratched the surface of TeX/Context).
Here is a very preliminary version.
\def\defineVERSION
{\dosingleargument\dodefineVERSION}
\def\dodefineVERSION[#1]%
{\dododefineVERSION