if (value.length() > 0 && value.charAt(0) == '@') {
StringValue fileName = value.substring(1);
Path path = env.lookup(fileName);
if (path == null || ! path.canRead()) {
env.warning(L.l("cannot read file '{0}'", fileName));
return false;
}
_postItems.add(new PathEntry(env, key.toString(), path));