How can one update chunk properties prefixed with an @?

[tidoust]

Added as an editor's note in PR #29: how can one update a chunk property prefixed with an @? Current @do update rules exclude @ properties from the list of properties updated in the module buffer.

However, it seems useful to update properties such as @subject, @object or @context. How can one do that?

[draggett]

Perhaps we can simply allow updates to specific @ properties such as @subject, @object and @context.

See also the use of @ with map, see:

   https://www.w3.org/Data/demos/chunks/chunks.html#compilation 

That involves a means to map @ names in rule to other names, so that rules can be manipulated as a collection of facts.