RDF Objects "An RDF Object is a compound data structure that is extracted from a database...Extraction algorithms are represented by RDFS classes  that are subclasses of ExtractionAlgorithm. Instances of these classes represent a particular extraction, and have associated properties that are used as parameters to the algorithm. The input database and output object are included as parameters to all algorithms...The RDF Object is extracted by first locating the focus resource in the database, and then by recursing in all directions from this resource through the graph to the specified depth. In traversing arcs between resources, the direction of the arrow is unimportant; both forward and backward arrows are traversed."
"If a list of vocabularies to include is specified, an arc will only be traversed if it is a property from a vocabulary that is in the inclusion list. If a list of vocabularies to exclude is specified, an arc will only be traversed if it isn't a property from a vocabulary that is in the exclusion list. "
This seems more like it.