source("sim.sgm", "impl.sgm") // two sources
.( // for each of those
root, // use root
// as well as path to ...
path("sw-function-spec/sw-function/
sw-function-variants/sw-function-variant")
)
. // for each of those
// path down ...
path("sw-data-dictionary-spec/sw-data-dictionaries/
sw-data-dictionary")
. // for each of those
contents // return the contents