Originally Posted by Toxaris
Sounds logical, but if it works fine in for example ADE, perhaps it will be more clear whether it is a bug or not allowed.
Call me cynical, but whether it works or not in ADE will give me no information about its validity
OK, it might be for some things, but this is a rather technical point where I wouldn't trust any particular implementation.
Anyway, apparently there was a sample Adobe book using this, see here