code: private Set<PackageResourceReferenceWrapper> addPackageResourceReferenceFromInterfaces(
  		Set<PackageResourceReferenceWrapper> packageResourceReferences, final Class<?> searchClass)
  	{
  		final Class<?>[] interfaces = searchClass.getInterfaces();
  		for (final Class<?> iface : interfaces)
  		{
  			packageResourceReferences = addFoundPackageResourceReferences(packageResourceReferences,
  				iface);
  		}
  		return packageResourceReferences;
  	}
docs: Adds the package resource reference from interfaces.
  
  @param packageResourceReferences
  the package resource references
  @param searchClass
  the search class
  @return 's a set with the founded interfaces from the given search class.