diff --git a/src/RideFile.cpp b/src/RideFile.cpp
index 2ea699935..810634855 100644
--- a/src/RideFile.cpp
+++ b/src/RideFile.cpp
@@ -17,8 +17,89 @@
  */
 
 #include "RideFile.h"
+#include <QtXml/QtXml>
 #include <assert.h>
 
+static void
+markInterval(QDomDocument &xroot, QDomNode &xride, QDomNode &xintervals,
+             double &startSecs, double prevSecs,
+             int &thisInterval, RideFilePoint *sample)
+{
+    if (xintervals.isNull()) {
+        xintervals = xroot.createElement("intervals");
+        xride.appendChild(xintervals);
+    }
+    QDomElement xinterval = xroot.createElement("interval").toElement();
+    xintervals.appendChild(xinterval);
+    xinterval.setAttribute("name", thisInterval);
+    xinterval.setAttribute("begin_secs",
+                           QString("%1").arg(startSecs, 0, 'f', 2));
+    xinterval.setAttribute("end_secs", 
+                           QString("%1").arg(prevSecs, 0, 'f', 2));
+    startSecs = sample->secs;
+    thisInterval = sample->interval;
+}
+
+bool
+RideFile::writeAsXml(QFile &file, QString &err)
+{
+    (void) err;
+    QDomDocument xroot("GoldenCheetah 1.0");
+    QDomNode xride = xroot.createElement("ride");
+    xroot.appendChild(xride);
+    QDomElement xstart = xroot.createElement("start").toElement();
+    xride.appendChild(xstart);
+    xstart.setAttribute("date", startTime_.toString("yyyy/MM/dd hh:mm:ss"));
+    QDomElement xrecint = xroot.createElement("sampling_period").toElement();
+    xride.appendChild(xrecint);
+    xrecint.setAttribute("secs", QString("%1").arg(recIntSecs_, 0, 'f', 3));
+    QDomNode xintervals;
+    bool hasNm = false;
+    QVector<double> intervalStart, intervalStop;
+    double startSecs = 0.0, prevSecs = 0.0;
+    int thisInterval = 0;
+    QListIterator<RideFilePoint*> i(dataPoints_);
+    RideFilePoint *sample = NULL;
+    while (i.hasNext()) {
+        sample = i.next();
+        if (sample->nm > 0.0)
+            hasNm = true;
+        assert(sample->secs >= 0.0);
+        if (sample->interval != thisInterval) {
+            markInterval(xroot, xride, xintervals, startSecs,
+                         prevSecs, thisInterval, sample);
+        }
+        prevSecs = sample->secs;
+    }
+    if (sample) {
+        markInterval(xroot, xride, xintervals, startSecs,
+                     prevSecs, thisInterval, sample);
+    }
+    QDomNode xsamples = xroot.createElement("samples");
+    xride.appendChild(xsamples);
+    i.toFront();
+    while (i.hasNext()) {
+        RideFilePoint *sample = i.next();
+        QDomElement xsamp = xroot.createElement("sample").toElement();
+        xsamples.appendChild(xsamp);
+        xsamp.setAttribute("secs", QString("%1").arg(sample->secs, 0, 'f', 2));
+        xsamp.setAttribute("cad", QString("%1").arg(sample->cad, 0, 'f', 0));
+        xsamp.setAttribute("hr", QString("%1").arg(sample->hr, 0, 'f', 0));
+        xsamp.setAttribute("km", QString("%1").arg(sample->km, 0, 'f', 3));
+        xsamp.setAttribute("kph", QString("%1").arg(sample->kph, 0, 'f', 1));
+        xsamp.setAttribute("watts", sample->watts);
+        if (hasNm) {
+            double nm = (sample->watts > 0.0) ? sample->nm : 0.0;
+            xsamp.setAttribute("nm", QString("%1").arg(nm, 0,'f', 1));
+        }
+    }
+    file.open(QFile::WriteOnly);
+    QTextStream ts(&file);
+    xroot.save(ts, 4);
+    file.close();
+    return true;
+}
+
 RideFileFactory *RideFileFactory::instance_;
 
 RideFileFactory &RideFileFactory::instance() 
diff --git a/src/RideFile.h b/src/RideFile.h
index d35ae83cc..21505d0f1 100644
--- a/src/RideFile.h
+++ b/src/RideFile.h
@@ -83,6 +83,8 @@ class RideFile
             dataPoints_.append(new RideFilePoint(secs, cad, hr, km, kph, 
                                                  nm, watts, interval));
         }
+
+        bool writeAsXml(QFile &file, QString &err);
 };
 
 struct RideFileReader {