This function will return an array list with a sequence of strings forming
the canonical reppresentation of the RDF that was fed
each string reppresent a triple and by joining them in the given order
the result can be used as needed for example in digital signatures.
The Gleaner examines an HTML representation of a web resource
to locate applicable GRDDL transformations and subsequently
applies those transformations to the original document to get
RDF descriptions.