Forward references

Hi,

Is it correct to make forward references in a RDF Notation3 description? 
Something like this,

(...)

cims:aggregation rdf:domain cims:Meta_Association

(...)

cims:Meta_Association rdf:type cims:Meta_NamedElement

(...)

The cims:Meta_Association is used before being described. 

Can this be application dependent? I can't find anything regarding this
subject in the present RDF docs (W3C working drafts, etc).

Also, is there any guidelines how should comments appear in a RDF file
(C/C++ driven)? Is this an application (implementation) issue?

Thanks,

-- 
Pedro

passis@dee.isep.ipp.pt | Tel. +351 22 8340500 Ext. 1712