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I created a process using the drools editor. The process defines two identical NS prefixes like so: xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" the generated <conditionExpression> looks like this (note the xs:type and xsi:type attributes): <conditionExpression xsi:type="tExpression" id="_s2yK4LL9EeCCt77rExCG6g" xs:type="tFormalExpression"/> when I open the process using the BPMN2 editor, it removes one of the duplicated NS prefixes (xmns:xs) so the <conditionExpression> becomes: <conditionExpression xsi:type="tExpression" id="_s2yK4LL9EeCCt77rExCG6g" xsi:type="tFormalExpression"/> this is a problem for the SAX parser. Stack trace: org.eclipse.emf.ecore.resource.Resource$IOWrappedException: Attribute "xsi:type" was already specified for element "conditionExpression". at org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.load(XMLLoadImpl.java:201) at org.eclipse.emf.ecore.xmi.impl.XMLResourceImpl.doLoad(XMLResourceImpl.java:242) at org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1511) at org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1290) at org.eclipse.bpmn2.modeler.core.ModelHandler.loadResource(ModelHandler.java:390) at org.eclipse.bpmn2.modeler.core.ModelHandlerLocator.createNewModelHandler(ModelHandlerLocator.java:74) at org.eclipse.bpmn2.modeler.core.ModelHandlerLocator.createModelHandler(ModelHandlerLocator.java:57) at org.eclipse.bpmn2.modeler.ui.editor.BPMN2Editor.setInput(BPMN2Editor.java:197) at org.eclipse.gef.ui.parts.GraphicalEditor.init(GraphicalEditor.java:346) at org.eclipse.graphiti.ui.internal.editor.DiagramEditorInternal.init(DiagramEditorInternal.java:1093) at org.eclipse.bpmn2.modeler.ui.editor.BPMN2Editor.init(BPMN2Editor.java:114) at org.eclipse.ui.internal.EditorManager.createSite(EditorManager.java:828) at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:647) at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465) at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595) at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:289) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2945) at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2850) at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2842) at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2793) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2789) at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2773) at org.eclipse.ui.actions.OpenWithMenu.openEditor(OpenWithMenu.java:331) at org.eclipse.ui.actions.OpenWithMenu$2.handleEvent(OpenWithMenu.java:179) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410) at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
done
