diff -r 7ceab500e1f6 -r 1aa71600000c demo/reader_writer_demo.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/demo/reader_writer_demo.cc	Fri Jul 01 16:10:46 2005 +0000
@@ -0,0 +1,83 @@
+#include <iostream>
+#include <lemon/smart_graph.h>
+#include <lemon/invalid.h>
+#include <lemon/graph_reader.h>
+#include <lemon/graph_writer.h>
+
+
+using namespace lemon;
+
+int main() {
+  SmartGraph graph;
+
+  try {
+    std::string filename="sample.lgf";
+    GraphReader<SmartGraph> reader(filename,graph);
+    SmartGraph::EdgeMap<int> cap(graph);
+    reader.readEdgeMap("capacity",cap);
+//     reader.readNode("source",s).readNode("target",t)
+//       .readEdgeMap("capacity",cap).run();
+    reader.run();
+
+    std::cout << "Hello! We have read a graph from file " << filename<< 
+      " and some maps on it: now we write this to the standard output!" << 
+      std::endl;
+
+
+    GraphWriter<SmartGraph> writer(std::cout, graph);
+    writer.writeEdgeMap("multiplicity", cap);
+//     writer.writeNode("source", s);
+//     writer.writeNode("target", t);
+    writer.run();
+     
+//     LemonReader reader(std::cin);
+
+//     NodeSetReader<SmartGraph> nodeset(reader, graph);
+//     SmartGraph::NodeMap<int> cost(graph);
+//     nodeset.readMap("cost", cost);
+//     SmartGraph::NodeMap<char> mmap(graph);
+//     nodeset.readMap("mmap", mmap);
+
+//     EdgeSetReader<SmartGraph> edgeset(reader, graph, nodeset);
+//     SmartGraph::EdgeMap<std::string> description(graph);
+//     edgeset.readMap<QuotedStringReader>("description", description);
+
+//     NodeReader<SmartGraph> nodes(reader, nodeset);
+//     SmartGraph::Node source;
+//     nodes.readNode("source", source);
+//     SmartGraph::Node target;
+//     nodes.readNode("target", target);
+
+//     AttributeReader<> attribute(reader, "gui");
+//     std::string author;
+//     attribute.readAttribute<LineReader>("author", author);
+//     int count;
+//     attribute.readAttribute("count", count);
+
+//     PrintReader print(reader);
+
+//     reader.run();
+
+
+//     for (SmartGraph::NodeIt it(graph); it != INVALID; ++it) {
+//       std::cout << cost[it] << ' ' << mmap[it] << std::endl;
+//     }
+
+//     for (SmartGraph::EdgeIt it(graph); it != INVALID; ++it) {
+//       std::cout << description[it] << std::endl;
+//     }
+
+//     std::cout << "author: " << author << std::endl;
+//     std::cout << "count: " << count << std::endl;
+
+//     std::cout << "source cost: " << cost[source] << std::endl;
+//     std::cout << "target cost: " << cost[target] << std::endl;
+
+//     std::cout.flush();
+  } catch (DataFormatError& error) {
+    std::cerr << error.what() << std::endl;
+  }
+
+
+  return 0;
+}