[gmt-dev] Error occurs while combining Xtext and Xtend.

["Xiaorui Zhang" <zxrvillain@xxxxxxxxx>]

Hi,
I am new to Xtend, and using it in my course project. In my project, first I use Xtext to define the dsl syntax. Then I want to transform the instance of the generated syntax ecore to the instance of another ecore( also EmfMetaModel which is different from the uml2->emfmetamodel example). The following presents what I've written: 

For the workflow :
<property name='targetDir' value='src-gen/'/>
	<component class="org.example.parser.ParserComponent">
		<metaModel class="
oaw.type.emf.EmfMetaModel " 
           metaModelFile="siwadsl.ecore" />
		<modelFile value="${modelFile}"/>
        <outputSlot value='theModel'/>
	</component>
	<component class=" oaw.xtend.XtendComponent">
	   <metaModel class="oaw.type.emf.EmfMetaModel"> 
           <metaModelFile value="dsl.ecore" />
       </metaModel> 
       <metaModel class=" oaw.type.emf.EmfMetaModel"> 
           <metaModelFile value="dsl.ecore" />
       </metaModel> 
       <invoke value="org::example::transform::transform(theModel)/>
        <outputSlot value="transformed_model"/>
  </component> 
      <component class="oaw.emf.XmiWriter">
	<modelFile value="out.xmi"/>
	<inputSlot value="transformed_model"/>
 
  </component>
</workflow>

For the transform.ext file:
import dsl;
import dsl;
create xxmodel this transform(xxmodel m):
   setName(
m.name)->
   xxxelement.addAll(m.xxxelement);
.....

   After running the workflow, I got error messages below: 
406  ERROR WorkflowParser     - The value of attribute "value" associated with an element type "invoke" must not contain the '<' character.
org.xml.sax.SAXParseException: The value of attribute "value" associated with an element type "invoke" must not contain the '<' character.
	at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException
(Unknown Source)
	at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source)
	at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
	at org.apache.xerces.impl.XMLErrorReporter.reportError
(Unknown Source)
	at org.apache.xerces.impl.XMLScanner.reportFatalError(Unknown Source)
	at org.apache.xerces.impl.XMLScanner.scanAttributeValue(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanAttribute
(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XML11Configuration.parse
(Unknown Source)
	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
	at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
	at javax.xml.parsers.SAXParser.parse(Unknown Source)
	at javax.xml.parsers.SAXParser.parse(Unknown Source)
	at org.openarchitectureware.workflow.ast.parser.WorkflowParser.parse(WorkflowParser.java:81)
	at org.openarchitectureware.workflow.ast.util.VisitorInitializer.visitInclusionAST
(VisitorInitializer.java:115)
	at org.openarchitectureware.workflow.ast.util.VisitorBase.visit(VisitorBase.java:34)
	at org.openarchitectureware.workflow.ast.AbstractASTBase.accept(AbstractASTBase.java:40)
	at org.openarchitectureware.workflow.ast.util.VisitorInitializer.traverseChildren
(VisitorInitializer.java:61)
	at org.openarchitectureware.workflow.ast.util.VisitorInitializer.visitComponentAST(VisitorInitializer.java:70)
	at org.openarchitectureware.workflow.ast.util.VisitorBase.visit(VisitorBase.java
:37)
	at org.openarchitectureware.workflow.ast.AbstractASTBase.accept(AbstractASTBase.java:40)
	at org.openarchitectureware.workflow.ast.util.WorkflowFactory.parseAndInitialize(WorkflowFactory.java:107)
	at org.openarchitectureware.workflow.ast.util.WorkflowFactory.parseInitAndCreate
(WorkflowFactory.java:58)
	at org.openarchitectureware.workflow.ast.util.WorkflowFactory.parseInitAndCreate(WorkflowFactory.java:53)
	at org.openarchitectureware.workflow.WorkflowRunner.prepare(WorkflowRunner.java:208)
	at org.openarchitectureware.workflow.WorkflowRunner.run(WorkflowRunner.java:169)
	at org.openarchitectureware.workflow.WorkflowRunner.main(WorkflowRunner.java:122)
422  ERROR WorkflowRunner     - The value of attribute "value" associated with an element type "invoke" must not contain the '<' character. [org/example/generator.oaw] 
422  ERROR WorkflowRunner     - Workflow interrupted because of configuration errors.

As shown above, the error message "The value of attribute "value" associated with an element type "invoke" must not contain the '<' character. [org/example/generator.oaw]" really got me confused. Why did it find a 
 the '<' character?

Does anyone can give me some clues? Is there anything wrong with my workflow configuration and extension file? Thank you in advance.

Regards,
Xiaorui
 





      


-- 
Best regards!
Sincerely yours,
Zhang Xiaorui
Master student of ICT, 
Agder University College
mob: +47 9429 8603
mailTo : zxrvillain@xxxxxxxxx