static IGraph CreatePageSummary(Uri newPageUri, string lower, string upper)
{
IGraph graph = new Graph();
INode resourceUri = graph.CreateUriNode(newPageUri);
graph.Assert(resourceUri, graph.CreateUriNode(Schema.Predicates.Lower), graph.CreateLiteralNode(lower));
graph.Assert(resourceUri, graph.CreateUriNode(Schema.Predicates.Upper), graph.CreateLiteralNode(upper));
return graph;
}