--- libgexf/filewriter.cpp	2009-10-29 14:57:33 +0000
+++ libgexf/filewriter.cpp	2010-12-04 15:11:25 +0000
@@ -334,8 +334,9 @@
         const t_id source_id = it->currentSource();
         const t_id target_id = it->currentTarget();
         const float weight = (float)it->currentProperty(EDGE_WEIGHT);
+        const string label = _gexf->getData().getEdgeLabel(edge_id);
         const t_edge_type type = (t_edge_type)it->currentProperty(EDGE_TYPE);
-        this->writeEdgeNode(writer, Conv::idToStr(edge_id), Conv::idToStr(source_id), Conv::idToStr(target_id), Conv::floatToStr(weight), Conv::edgeTypeToStr(type));
+        this->writeEdgeNode(writer, Conv::idToStr(edge_id), Conv::idToStr(source_id), Conv::idToStr(target_id), Conv::floatToStr(weight), Conv::edgeTypeToStr(type), label);
     }
 
     /* Close the element named edges. */
@@ -346,7 +347,7 @@
 }
 
 //-----------------------------------------
-void FileWriter::writeEdgeNode(xmlTextWriterPtr writer, const std::string& edge_id, const std::string& source_id, const std::string& target_id, const std::string& weight, const std::string& type) {
+void FileWriter::writeEdgeNode(xmlTextWriterPtr writer, const std::string& edge_id, const std::string& source_id, const std::string& target_id, const std::string& weight, const std::string& type, const std::string& label) {
 //-----------------------------------------
     /* Write an element named "edge" as child of edges. */
     int rc = xmlTextWriterStartElement(writer, BAD_CAST "edge");
@@ -394,6 +395,12 @@
         }
     }
 
+    /* Add an attribute with name "label" */
+    rc = xmlTextWriterWriteAttribute(writer, BAD_CAST "label", BAD_CAST label.c_str());
+    if (rc < 0) {
+        throw FileWriterException( "Error at xmlTextWriterWriteAttribute");
+    }
+
     AttValueIter* row = _gexf->getData().getEdgeAttributeRow(Conv::strToId(edge_id));
     if( row != NULL && row->hasNext() ) {
         this->writeAttvaluesNode(writer, EDGE, edge_id);

--- libgexf/filewriter.h	2009-09-07 11:16:14 +0000
+++ libgexf/filewriter.h	2010-12-04 15:08:13 +0000
@@ -91,7 +91,7 @@
     void writeNodesNode(xmlTextWriterPtr writer);
     void writeNodeNode(xmlTextWriterPtr writer, const std::string& node_id, const std::string& label="");
     void writeEdgesNode(xmlTextWriterPtr writer);
-    void writeEdgeNode(xmlTextWriterPtr writer, const std::string& edge_id, const std::string& source_id, const std::string& target_id, const std::string& cardinal="1", const std::string& type="undirected");
+    void writeEdgeNode(xmlTextWriterPtr writer, const std::string& edge_id, const std::string& source_id, const std::string& target_id, const std::string& cardinal="1", const std::string& type="undirected", const std::string& label="");
 
     void writeAttributesNode(xmlTextWriterPtr writer, const std::string& element_class);
     void writeAttributeNode(xmlTextWriterPtr writer, const std::string& id, const std::string& title, const std::string& type, const std::string& default_value="", const std::string& options="");