this is the properly formatted, posix-compliant, lower-cased ${namespace}:${importer_path} key that is unique to each importer. this key will be used to deduce which importer to associate the imported entity with, once the bundle has been emitted.
${namespace}:${importer_path}
the output path of the eitted imported entity.
this is the properly formatted, posix-compliant, lower-cased
${namespace}:${importer_path}key that is unique to each importer. this key will be used to deduce which importer to associate the imported entity with, once the bundle has been emitted.