Index: EditingDefaultWorkflowPlugin.java
===================================================================
--- EditingDefaultWorkflowPlugin.java	(revision 109235)
+++ EditingDefaultWorkflowPlugin.java	(working copy)
@@ -26,12 +26,16 @@
 import org.hippoecm.frontend.service.IEditor.Mode;
 import org.hippoecm.frontend.service.IEditorFilter;
 import org.hippoecm.frontend.service.IEditorManager;
+import org.hippoecm.frontend.validation.IValidationResult;
+import org.hippoecm.frontend.validation.IValidationService;
+import org.hippoecm.frontend.validation.ValidationException;
 import org.hippoecm.repository.api.Workflow;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import javax.jcr.Node;
 import javax.jcr.RepositoryException;
+import java.util.List;
 
 public class EditingDefaultWorkflowPlugin extends CompatibilityWorkflowPlugin {
     @SuppressWarnings("unused")
@@ -41,6 +45,8 @@
 
     private static Logger log = LoggerFactory.getLogger(EditingDefaultWorkflowPlugin.class);
 
+    private boolean isValid = true;
+
     public EditingDefaultWorkflowPlugin(final IPluginContext context, IPluginConfig config) {
         super(context, config);
 
@@ -65,6 +71,10 @@
                 new ResourceReference(EditingDefaultWorkflowPlugin.class, "document-save-16.png")) {
             @Override
             protected String execute(Workflow wf) throws Exception {
+                validate();
+                if (!isValid()) {
+                    return null;
+                }
                 ((WorkflowDescriptorModel) getDefaultModel()).getNode().save();
                 return null;
             }
@@ -75,6 +85,10 @@
 
             @Override
             protected String execute(Workflow wf) throws Exception {
+                validate();
+                if (!isValid()) {
+                    return null;
+                }
                 Node docNode = ((WorkflowDescriptorModel) EditingDefaultWorkflowPlugin.this.getDefaultModel())
                         .getNode();
                 IEditorManager editorMgr = getPluginContext().getService(
@@ -94,4 +108,21 @@
             }
         });
     }
+
+     void validate() throws ValidationException {
+        isValid = true;
+        List<IValidationService> validators = getPluginContext().getServices(
+                getPluginConfig().getString(IValidationService.VALIDATE_ID), IValidationService.class);
+        if (validators != null) {
+            for (IValidationService validator : validators) {
+                validator.validate();
+                IValidationResult result = validator.getValidationResult();
+                isValid = isValid && result.isValid();
+            }
+        }
+    }
+
+    boolean isValid() {
+        return isValid;
+    }
 }