Reads the content of a local file or a file reachable over http and places the content in a [process] variable or a [workitem] field.

Always attempts to parse the content as JSON. If the parsing fails, simply considers as plain text.

  Ruote.process_definition do
    read 'http://defs.example.org/filters/filter1.json', :to => 'x'
    read 'http://defs.example.org/filters/filter1.json', :to => 'f:x'
    read 'http://defs.example.org/filters/filter2.json', :to => 'v:y'
    read 'filters/filter3.json', :to => 'f:y'
    read 'texts/greetings${f:greeting_index}.txt', :to => 'f:greetings'
    # ...
  end