Index: src/main/java/hudson/plugins/plot/Plot.java
===================================================================
--- src/main/java/hudson/plugins/plot/Plot.java	(revision 14231)
+++ src/main/java/hudson/plugins/plot/Plot.java	(working copy)
@@ -29,6 +29,9 @@
 import java.util.Properties;
 import java.util.logging.Logger;
 
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathFactory;
+
 import org.jfree.chart.ChartFactory;
 import org.jfree.chart.ChartRenderingInfo;
 import org.jfree.chart.ChartUtilities;
@@ -43,6 +46,7 @@
 import org.jfree.chart.renderer.category.LineAndShapeRenderer;
 import org.kohsuke.stapler.StaplerRequest;
 import org.kohsuke.stapler.StaplerResponse;
+import org.xml.sax.InputSource;
 
 import au.com.bytecode.opencsv.CSVReader;
 import au.com.bytecode.opencsv.CSVWriter;
@@ -649,7 +653,16 @@
             in = seriesFiles[0].read();
             logger.println("Saving plot series data from: " + seriesFiles[0]);
             Properties data = new Properties();
-            data.load(in);
+            if (series.getXPath() == null) {
+              data.load(in);
+            } else {
+              InputSource xmlSource = new InputSource(in);
+
+              XPathFactory factory = XPathFactory.newInstance();
+              XPath xpath = factory.newXPath();
+              String yvalue = xpath.evaluate(series.getXPath(), xmlSource);
+              data.setProperty("YVALUE", yvalue);
+            }
             return data;
         } catch (Exception e) {
             logger.println("Exception reading plot series data from: " + seriesFiles[0]);
Index: src/main/java/hudson/plugins/plot/PlotPublisher.java
===================================================================
--- src/main/java/hudson/plugins/plot/PlotPublisher.java	(revision 14231)
+++ src/main/java/hudson/plugins/plot/PlotPublisher.java	(working copy)
@@ -209,6 +209,7 @@
             String[] groups = req.getParameterValues("plotParam.group");
             String[] numBuilds = req.getParameterValues("plotParam.numBuilds");
         	String[] seriesFiles = req.getParameterValues("seriesParam.file");
+        	String[] seriesXPaths = req.getParameterValues("seriesParam.xpath");
         	String[] seriesLabels = req.getParameterValues("seriesParam.label");
             if (seriesFiles != null) {
             	//LOGGER.info(fileNames.length+","+titles.length+","+yaxises.length+","+
@@ -222,7 +223,7 @@
                 		    ! seriesFiles[seriesCounter].equals("PLOT_SEPARATOR")) 
                 	{
                     	seriesList.add(new Series(seriesFiles[seriesCounter],
-                    							  seriesLabels[seriesCounter]));
+                    		seriesXPaths[seriesCounter], seriesLabels[seriesCounter]));
                     	seriesCounter++;
                     }
                 	seriesCounter++; //skip past separator
Index: src/main/java/hudson/plugins/plot/Series.java
===================================================================
--- src/main/java/hudson/plugins/plot/Series.java	(revision 14231)
+++ src/main/java/hudson/plugins/plot/Series.java	(working copy)
@@ -16,6 +16,11 @@
     public String file;
 
     /**
+     * Data series XPath expression. Optional.
+     */
+    public String xpath;
+
+  /**
      * Data series legend label. Optional.
      */
     public String label;
@@ -23,8 +28,9 @@
     /**
      * @stapler-constructor
      */
-    public Series(String file, String label) {
+    public Series(String file, String xpath, String label) {
         this.file = file;
+        this.xpath = xpath;
         this.label = label;
     }
 
@@ -33,6 +39,11 @@
     public String getFile() {
         return file;
     }
+
+    public String getXPath() {
+        return xpath;
+    }
+
     public String getLabel() {
         return label;
     }
Index: src/main/resources/hudson/plugins/plot/PlotPublisher/config.jelly
===================================================================
--- src/main/resources/hudson/plugins/plot/PlotPublisher/config.jelly	(revision 14231)
+++ src/main/resources/hudson/plugins/plot/PlotPublisher/config.jelly	(working copy)
@@ -29,6 +29,9 @@
 	                  <f:textbox name="seriesParam.file" value="${series.file}" 
 	                    checkUrl="'${rootURL}/publisher/PlotPublisher/checkSeriesFile?job=${it.fullName}&amp;value='+escape(this.value)"/>
 	                </f:entry>
+	                <f:entry title="Data series XPath expression" help="/plugin/plot/help-xpath.html">
+	                  <f:textbox name="seriesParam.xpath" value="${series.xpath}"/>
+	                </f:entry>
 	                <f:entry title="Data series legend label" help="/plugin/plot/help-legend.html">
 	                  <f:textbox name="seriesParam.label" value="${series.label}" />
 	                </f:entry>
Index: src/main/webapp/help-series.html
===================================================================
--- src/main/webapp/help-series.html	(revision 14231)
+++ src/main/webapp/help-series.html	(working copy)
@@ -1,10 +1,11 @@
 <div>
-  Mandatory. Specifies the path to the Java property file (key=value pairs), relative to
+  Mandatory. Specifies the path to the Java property file (key=value pairs) or XML-file, relative to
   <a href='ws/'>the workspace root</a>, that
-  contains the data value for this data series.  The file must
+  contains the data value for this data series.  If it is a property file, the file must
   contain a <code>YVALUE</code> property and may optionally
   contain a <code>URL</code> property. If present, the URL will be 
-  opened when the data point on the plot is clicked.
+  opened when the data point on the plot is clicked. If it is a XML-file, the XPath expression must be
+  set.
   <p>
   The specification of this file can use wildcards like <code>build/report/*/report.properties</code>
   but only the first file resolved by the wildcard will be used.