Index: modules/api/src/main/resources/jpdl-4.4.xsd
===================================================================
--- modules/api/src/main/resources/jpdl-4.4.xsd	(revision 6377)
+++ modules/api/src/main/resources/jpdl-4.4.xsd	(working copy)
@@ -375,16 +375,16 @@
             <extension base="tns:wireObjectType">
               <sequence>
                 <element ref="tns:on" minOccurs="0" maxOccurs="unbounded"/>
-                <element ref="tns:transition" minOccurs="0" maxOccurs="unbounded" >
+                <element name="transition" minOccurs="0" maxOccurs="unbounded" >
                   <complexType>
-		                <complexContent>
-		                  <extension base="tns:transitionType">
-		                    <sequence>
-		                      <element ref="tns:timer" minOccurs="0" />
-		                    </sequence>
-		                  </extension>
-		                </complexContent>
-		              </complexType>
+                    <complexContent>
+                      <extension base="tns:transitionType">
+                        <sequence>
+                          <element ref="tns:timer" minOccurs="0" />
+                        </sequence>
+                      </extension>
+                    </complexContent>
+                  </complexType>
                 </element>
               </sequence>
               <attributeGroup ref="tns:activityAttributes" />
@@ -927,6 +927,10 @@
       should be automatically wired based on matching the property names and types with the 
       object names and types</documentation></annotation>
     </attribute>
+    <attribute name="cache" type="tns:booleanValueType">
+      <annotation><documentation>Indicates if the user code should be cache or not
+      </documentation></annotation>
+    </attribute>
   </complexType>
 
   <complexType name="argType">
@@ -934,6 +938,9 @@
     Each 'arg' element should have exactly one child element 
     that represents the value of the argument.
     </documentation></annotation>
+    <sequence minOccurs="1" maxOccurs="1">
+      <group ref="tns:wireObjectGroup" />
+    </sequence>
     <attribute name="type" type="string">
       <annotation><documentation>The java class name representing 
       the type of the method.  This is optional and can be used to 
@@ -1282,36 +1289,40 @@
   </group>
   
   <complexType name="mailType">
-    <sequence>
-      <element name="description" minOccurs="0" maxOccurs="unbounded" type="string" />
-      <element name="from" type="tns:mailRecipientType" minOccurs="0" />
-      <element name="to" type="tns:mailRecipientType" minOccurs="0" />
-      <element name="cc" type="tns:mailRecipientType" minOccurs="0" />
-      <element name="bcc" type="tns:mailRecipientType" minOccurs="0" />
-      <element name="subject" type="string" minOccurs="0" />
-      <element name="text" type="string" minOccurs="0" />
-      <element name="html" type="string" minOccurs="0" />
-      <element name="attachments" minOccurs="0" >
-        <complexType>
-          <sequence>
-            <element name="attachment" maxOccurs="unbounded">
-              <complexType>
-						    <attribute name="url" type="string">
-						      <annotation><documentation>URL reference to the attachment</documentation></annotation>
-						    </attribute>
-                <attribute name="resource" type="string">
-                  <annotation><documentation>Name of the attachment resource on the classpath</documentation></annotation>
-                </attribute>
-                <attribute name="file" type="string">
-                  <annotation><documentation>File reference to the attachment</documentation></annotation>
-                </attribute>
-              </complexType>
-            </element>
-          </sequence>
-        </complexType>
-      </element>
-    </sequence>
-    <attribute name="template" type="tns:templateType" />
+    <complexContent>
+      <extension base="tns:wireObjectType">
+        <sequence>
+          <element name="description" minOccurs="0" maxOccurs="unbounded" type="string" />
+          <element name="from" type="tns:mailRecipientType" minOccurs="0" />
+          <element name="to" type="tns:mailRecipientType" minOccurs="0" />
+          <element name="cc" type="tns:mailRecipientType" minOccurs="0" />
+          <element name="bcc" type="tns:mailRecipientType" minOccurs="0" />
+          <element name="subject" type="string" minOccurs="0" />
+          <element name="text" type="string" minOccurs="0" />
+          <element name="html" type="string" minOccurs="0" />
+          <element name="attachments" minOccurs="0" >
+            <complexType>
+              <sequence>
+                <element name="attachment" maxOccurs="unbounded">
+                  <complexType>
+                    <attribute name="url" type="string">
+                      <annotation><documentation>URL reference to the attachment</documentation></annotation>
+                    </attribute>
+                    <attribute name="resource" type="string">
+                      <annotation><documentation>Name of the attachment resource on the classpath</documentation></annotation>
+                    </attribute>
+                    <attribute name="file" type="string">
+                      <annotation><documentation>File reference to the attachment</documentation></annotation>
+                    </attribute>
+                  </complexType>
+                </element>
+              </sequence>
+            </complexType>
+          </element>
+        </sequence>
+        <attribute name="template" type="tns:templateType" />
+      </extension>
+    </complexContent>
   </complexType>
   
   <complexType name="jmsType">
Index: modules/jpdl/src/main/java/org/jbpm/jpdl/internal/xml/JpdlParser.java
===================================================================
--- modules/jpdl/src/main/java/org/jbpm/jpdl/internal/xml/JpdlParser.java	(revision 6377)
+++ modules/jpdl/src/main/java/org/jbpm/jpdl/internal/xml/JpdlParser.java	(working copy)
@@ -84,16 +84,18 @@
   public static final String NAMESPACE_JPDL_40 = "http://jbpm.org/4.0/jpdl";
   public static final String NAMESPACE_JPDL_42 = "http://jbpm.org/4.2/jpdl";
   public static final String NAMESPACE_JPDL_43 = "http://jbpm.org/4.3/jpdl";
+  public static final String NAMESPACE_JPDL_44 = "http://jbpm.org/4.4/jpdl";
 
-  public static final String CURRENT_VERSION_JBPM = "4.3";
+  public static final String CURRENT_VERSION_JBPM = "4.4";
   public static final String CURRENT_VERSION_NAMESPACE = "http://jbpm.org/"+CURRENT_VERSION_JBPM+"/jpdl";
   public static final String CURRENT_VERSION_PROCESS_LANGUAGE_ID = "jpdl-"+CURRENT_VERSION_JBPM;
-  
+
   public static final List<String> SCHEMA_RESOURCES = new ArrayList<String>();
   static {
     SCHEMA_RESOURCES.add("jpdl-4.0.xsd");
     SCHEMA_RESOURCES.add("jpdl-4.2.xsd");
     SCHEMA_RESOURCES.add("jpdl-4.3.xsd");
+    SCHEMA_RESOURCES.add("jpdl-4.4.xsd");
   }
 
   // array elements are mutable, even when final
Index: modules/jpdl/src/test/java/org/jbpm/jpdl/parsing/ArgParsingTest.java
===================================================================
--- modules/jpdl/src/test/java/org/jbpm/jpdl/parsing/ArgParsingTest.java	(revision 0)
+++ modules/jpdl/src/test/java/org/jbpm/jpdl/parsing/ArgParsingTest.java	(revision 0)
@@ -0,0 +1,52 @@
+package org.jbpm.jpdl.parsing;
+
+import java.util.List;
+import org.jbpm.api.activity.ActivityBehaviour;
+import org.jbpm.api.model.Activity;
+import org.jbpm.api.model.OpenExecution;
+import org.jbpm.jpdl.internal.activity.DecisionConditionActivity;
+import org.jbpm.pvm.internal.client.ClientProcessDefinition;
+import org.jbpm.pvm.internal.el.Expression;
+import org.jbpm.pvm.internal.el.StaticTextExpression;
+import org.jbpm.pvm.internal.model.ActivityImpl;
+import org.jbpm.pvm.internal.model.Condition;
+import org.jbpm.pvm.internal.model.ProcessDefinitionImpl;
+import org.jbpm.pvm.internal.model.ExecutionImpl;
+import org.jbpm.pvm.internal.model.TransitionImpl;
+import org.jbpm.pvm.internal.wire.usercode.UserCodeCondition;
+import org.jbpm.pvm.internal.xml.Problem;
+
+/**
+ * JBPM-2715.
+ *
+ * @author Huisheng Xu
+ */
+public class ArgParsingTest extends JpdlParseTestCase {
+
+  public void testArgParse() {
+    String xmlString =
+        "<process name='MyProsess' version='1' xmlns='http://jbpm.org/4.4/jpdl'>\n" +
+        "  <start name='start'>\n" +
+        "    <transition name='myTransition' to='end'>\n" +
+        "      <event-listener class='com.comp.MyEventListener'>\n" +
+        "        <field name='myObjectField'>\n" +
+        "          <object class='com.comp.MyObjectField'>\n" +
+        "            <constructor>\n" +
+        "              <arg type='java.lang.String'><string value='hello world'/></arg>\n" +
+        "            </constructor>\n" +
+        "          </object>\n" +
+        "        </field>\n" +
+        "      </event-listener>\n" +
+        "    </transition>\n" +
+        "  </start>\n" +
+        "  <end name='end'/>\n" +
+        "</process>\n";
+
+    List<Problem> problems = jpdlParser.createParse()
+               .setString(xmlString)
+               .execute()
+               .getProblems();
+
+    assertEquals("[]", problems.toString());
+  }
+}
Index: modules/jpdl/src/test/java/org/jbpm/jpdl/parsing/CacheParsingTest.java
===================================================================
--- modules/jpdl/src/test/java/org/jbpm/jpdl/parsing/CacheParsingTest.java	(revision 0)
+++ modules/jpdl/src/test/java/org/jbpm/jpdl/parsing/CacheParsingTest.java	(revision 0)
@@ -0,0 +1,44 @@
+package org.jbpm.jpdl.parsing;
+
+import java.util.List;
+import org.jbpm.api.activity.ActivityBehaviour;
+import org.jbpm.api.model.Activity;
+import org.jbpm.api.model.OpenExecution;
+import org.jbpm.jpdl.internal.activity.DecisionConditionActivity;
+import org.jbpm.pvm.internal.client.ClientProcessDefinition;
+import org.jbpm.pvm.internal.el.Expression;
+import org.jbpm.pvm.internal.el.StaticTextExpression;
+import org.jbpm.pvm.internal.model.ActivityImpl;
+import org.jbpm.pvm.internal.model.Condition;
+import org.jbpm.pvm.internal.model.ProcessDefinitionImpl;
+import org.jbpm.pvm.internal.model.ExecutionImpl;
+import org.jbpm.pvm.internal.model.TransitionImpl;
+import org.jbpm.pvm.internal.wire.usercode.UserCodeCondition;
+import org.jbpm.pvm.internal.xml.Problem;
+
+/**
+ * JBPM-2849.
+ *
+ * @author Huisheng Xu
+ */
+public class CacheParsingTest extends JpdlParseTestCase {
+
+  public void testCacheParse() {
+    String xmlString =
+        "<process name='MyProsess' version='1' xmlns='http://jbpm.org/4.4/jpdl'>\n" +
+        "  <start name='start'>\n" +
+        "    <transition name='myTransition' to='end'>\n" +
+        "      <event-listener class='com.comp.MyEventListener' cache='disabled'/>\n" +
+        "    </transition>\n" +
+        "  </start>\n" +
+        "  <end name='end'/>\n" +
+        "</process>\n";
+
+    List<Problem> problems = jpdlParser.createParse()
+               .setString(xmlString)
+               .execute()
+               .getProblems();
+
+    assertEquals("[]", problems.toString());
+  }
+}
Index: modules/jpdl/src/test/java/org/jbpm/jpdl/parsing/MailParsingTest.java
===================================================================
--- modules/jpdl/src/test/java/org/jbpm/jpdl/parsing/MailParsingTest.java	(revision 0)
+++ modules/jpdl/src/test/java/org/jbpm/jpdl/parsing/MailParsingTest.java	(revision 0)
@@ -0,0 +1,45 @@
+package org.jbpm.jpdl.parsing;
+
+import java.util.List;
+import org.jbpm.api.activity.ActivityBehaviour;
+import org.jbpm.api.model.Activity;
+import org.jbpm.api.model.OpenExecution;
+import org.jbpm.jpdl.internal.activity.DecisionConditionActivity;
+import org.jbpm.pvm.internal.client.ClientProcessDefinition;
+import org.jbpm.pvm.internal.el.Expression;
+import org.jbpm.pvm.internal.el.StaticTextExpression;
+import org.jbpm.pvm.internal.model.ActivityImpl;
+import org.jbpm.pvm.internal.model.Condition;
+import org.jbpm.pvm.internal.model.ProcessDefinitionImpl;
+import org.jbpm.pvm.internal.model.ExecutionImpl;
+import org.jbpm.pvm.internal.model.TransitionImpl;
+import org.jbpm.pvm.internal.wire.usercode.UserCodeCondition;
+import org.jbpm.pvm.internal.xml.Problem;
+
+/**
+ * JBPM-2843.
+ *
+ * @author Huisheng Xu
+ */
+public class MailParsingTest extends JpdlParseTestCase {
+
+  public void testMailParse() {
+    String xmlString =
+        "<process name='MyProsess' version='1' xmlns='http://jbpm.org/4.4/jpdl'>" +
+        "  <start name='start'>" +
+        "    <transition to='mail'/>" +
+        "  </start>" +
+        "  <mail name='mail' lang='java' class='org.MyMailProducer'>" +
+        "    <transition to='end'/>" +
+        "  </mail>" +
+        "  <end name='end'/>" +
+        "</process>";
+
+    List<Problem> problems = jpdlParser.createParse()
+               .setString(xmlString)
+               .execute()
+               .getProblems();
+
+    assertEquals("[]", problems.toString());
+  }
+}