This transformation produces a list of GRDDL profile transformers
from XHTML. It implements the mechanism (@@@not yet) described in the GRDDL spec, where each link (link or a) with a rel attribute set to profileTransformation is used to identify a transformer associated to the profile identified by the URI of the given document. It also allows to describe profiles identified by fragments of the URI of the given document, in an elements with a class attribute set to subProfile, containing a link to the said fragment with a rel attribute set to profile, and another link with a profileTransformation rel as described above.