code: public Set getValueFromModel(Model model)
  	{
  		Set<? extends BioPAXElement> domains = new HashSet<BioPAXElement>(model.getObjects(this.getDomain()));
  		return getValueFromBeans(domains);
  	}
docs: This method runs the path query on all the elements within the model.
  @param model to be queried
  @return a merged set of all values that is reachable by the paths starting from all applicable objects in
  the model. For example running ProteinReference/xref:UnificationXref on the model will get all the
  unification xrefs of all ProteinReferences.