Using Xcore with Xtext

modelsUsing
with
Holger Schill

You will come to the point…
Where you want to take control…

Problem
grammar org.xtext.example.mydsl.MyDsl with org.eclipse.xtext.common.Terminals
generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"
Model:
elements+=AbstractElement*;
AbstractElement:
Element | SecondElement | ThirdElement
;
Element:
'Element' name=ID ref=[AbstractElement]
;
SecondElement:
'SecondElement' name=ID
;
ThirdElement:
'ThirdElement' name=ID
;
Example

Model:
elements+=AbstractElement*;
AbstractElement:
Element | SecondElement | ThirdElement
;
Element:
'Element' name=ID ref=[Referenceable]
;
SecondElement:
'SecondElement' name=ID
;
ThirdElement:
'ThirdElement' name=ID
;
Referenceable:
SecondElement | ThirdElement
;
Never invoked by the parser
Example
Fake Rules to influence EMF Generator

For rapid prototyping the generated model is fine
When to stay with the generated model

Automatic synchronisation from grammar to model

Automatic synchronisation from grammar to model
If you do not need to introduce fake rules

But what if…
DSL DSL DSL
Order for generating DSLs is important

But what if…
DSL DSL DSL
Order for generating DSLs is important
Eagerly loaded

DSL DSL
DSLs reference each other
But what if…

Still that tree editor…
Merging can be difficult

Put code directly in the model

Load Xcore file
No Registration needed
Workflow configuration

Don’t forget the Xcore dependency

Don’t forget the Xcore dependency
Caused by: org.xml.sax.SAXParseExceptionpublicId: platform:/resource/org.xtext.example.mydsl.model/model/MyDsl.xcore; systemId:
platform:/resource/org.xtext.example.mydsl.model/model/MyDsl.xcore; lineNumber: 1; columnNumber: 1; Content is not allowed in
prolog.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:177)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:441)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:368)
at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1436)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:999)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:
510)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
Invokes XcoreStandaloneSetup to register *.xcore

More complex setups
Ecore
model
Xcore
model
Xtext DSL
Xcore imports another ecore model
Xtext DSL imports Xcore

Ecore
model
Xcore
model
Xtext DSL

Caused by: java.lang.IllegalStateException: Problem parsing 'classpath:/org/xtext/example/
mydsl/MyDsl.xtext':
TransformationDiagnostic: null:9 Cannot find compatible feature name in sealed EClass
Greeting from imported package http://www.xtext.org/example/mydsl/MyDsl: The type 'Greeting'
does not have a feature 'name'. (ErrorCode: CannotCreateTypeInSealedMetamodel)
at org.eclipse.xtext.generator.LanguageConfig.setUri(LanguageConfig.java:247)
... 42 more
You will face that Exception

Caused by: java.lang.IllegalStateException: Problem parsing 'classpath:/org/xtext/example/
mydsl/MyDsl.xtext':
TransformationDiagnostic: null:9 Cannot find compatible feature name in sealed EClass
Greeting from imported package http://www.xtext.org/example/mydsl/MyDsl: The type 'Greeting'
does not have a feature 'name'. (ErrorCode: CannotCreateTypeInSealedMetamodel)
at org.eclipse.xtext.generator.LanguageConfig.setUri(LanguageConfig.java:247)
... 42 more
You will face that Exception
Ecore
model
Xcore
model
Proxy not resolvable
Index is not aware of genmodel
that the Xcore model links against
Proxy

But I added that stuff in the StandaloneSetup…?

But I added that stuff in the StandaloneSetup…?
ResourceSet
Resource
Resource
Resource
Resource
ResourceSet
Resource
Resource

Ecore
model
Xcore
model
Proxy
What’s happening?
ResourceSet
Grammar
Xcore resource
Ecore model
Genmodel
Index
ResourceDescription
ResourceDescription
ResourceDescription
ResourceDescription

Ecore
model
Xcore
model
Proxy
What’s happening?
Name
Index
ResourceDescription
ResourceDescription
ResourceDescription
ResourceDescription

Ecore
model
Xcore
model
Proxy
What’s happening?
URI
Index
ResourceDescription
ResourceDescription
ResourceDescription
ResourceDescription

Ecore
model
Xcore
model
What’s happening?
resolved
Index
ResourceDescription
ResourceDescription
ResourceDescription
ResourceDescription

More complex example
Xtext DSL Xtext DSL
Languages referencing each other

Xtext DSL Xtext DSL
Languages referencing each other
Plugin
Xtext
DSL 1
Plugin
Xtext
DSL 1
Problem
Circular dependency
Buddypolicy

Introduce a Ecore model as a protocol
Xtext DSL Xtext DSL
Ecore
model
Generated
Model
Generated
Model

import "http://www.xtext.org/common/model" as common
PackageDeclaration returns common::PackageDeclaration:
'package' name=FQN
content+=Element
;
Element returns common::NamedElement:
{Element}
'element' name=ID '{'
ref=[common::Referenceable | FQN]?
'}'
;
FQN:
ID ('.' ID)*
;
Introduce a Ecore model as a protocol

Xtext DSL Xtext DSL
Xcore
model
Xcore
model
Imported
Model
Imported
Model

Xtext DSL Xtext DSL
Xcore
model
Xcore
model
Imported
Model
Imported
Model
Same Plugin

Xtext DSL Xtext DSL
Xcore
model
Xcore
model
Imported
Model
Imported
Model
Different plugins

Xtext DSL Xtext DSL
Ecore
model
Xcore
model
Xcore
model
Imported
Model
Imported
Model

Ecore
model
Xcore
model
Xcore
model

grammar org.xtext.example.firstdsl.Lang with org.eclipse.xtext.common.Terminals
import "org.xtext.example.myfirstdsl"
import "http://www.eclipse.org/emf/2002/Ecore" as ecore
import "org.xtext.example.myseconddsl" as second
PackageDeclaration returns common::PackageDeclaration :
'package' name=FQN
content+=FirstElement*
;
FirstElement :
ref=[second::SecondElement| FQN]?
'}'
;
FQN:
ID ('.' ID)*
;
A lot of imports…

'package' name=FQN
;
FirstElement :
'}'
;
FQN:
ID ('.' ID)*
;
Have same root node…

'package' name=FQN
;
FirstElement :
'}'
;
FQN:
ID ('.' ID)*
;
Use implicitly imported classifier

MWE2 configuration
Same for both languages

'package' name=FQN
;
FirstElement :
'}'
;
FQN:
ID ('.' ID)*
;
But there is a small problem

'package' name=FQN
;
FirstElement :
'}'
;
FQN:
ID ('.' ID)*
;
CA is showing both elements?

Xtext DSL Xtext DSL
Ecore
model
Xcore
model
Xcore
model
generated
Model
generated
Model
One way to solve that…

One way to solve that…
grammar org.xtext.example.seconddsl.Lang with org.eclipse.xtext.common.Terminals
generate generatedSecondModel "http://www.xtext.org/generatedSecondModel"
import "org.xtext.example.myseconddsl"
import "org.xtext.example.myfirstdsl" as first
'package' name=FQN
content+=SecondElement*
;
SecondElement returns SecondElement:
{CustomSecondElement}
ref=[first::FirstElement | FQN]?
'}'
;
FQN:
ID ('.' ID)*
;

But when I run it….
[ERROR]: GeneratorException: (Element: -UNKNOWN-; Reported by: Generator)
java.lang.RuntimeException: Could not find a GenModel for EPackage 'http://www.xtext.org/
generatedSecondModel' from http://www.xtext.org/generatedSecondModel
If the missing GenModel has been generated via EMFGeneratorFragment or EcoreGeneratorFragment make
sure to run it first in the workflow.
If you have a *.genmodel-file, make sure to register it via
StandaloneSetup.registerGenModelFile(String)
at org.eclipse.xtext.generator.GenModelAccess.getGenModelResource(GenModelAccess.java:137)
at org.eclipse.xtext.generator.GenModelAccess.getGenPackage(GenModelAccess.java:85)

But when I run it….
// generates Java API for the generated EPackages
fragment = ecore.EMFGeneratorFragment auto-inject {}
Don’t forget the EMFGeneratorFragment
[ERROR]: GeneratorException: (Element: -UNKNOWN-; Reported by: Generator)
java.lang.RuntimeException: Could not find a GenModel for EPackage 'http://www.xtext.org/
generatedSecondModel' from http://www.xtext.org/generatedSecondModel
If the missing GenModel has been generated via EMFGeneratorFragment or EcoreGeneratorFragment make
sure to run it first in the workflow.
If you have a *.genmodel-file, make sure to register it via
StandaloneSetup.registerGenModelFile(String)
at org.eclipse.xtext.generator.GenModelAccess.getGenModelResource(GenModelAccess.java:137)
at org.eclipse.xtext.generator.GenModelAccess.getGenPackage(GenModelAccess.java:85)

There was nothing about Xbase so far…

Wizard does crazy things…// automatically generated by Xtext
import "http://www.xtext.org/example/xbase"
import "http://www.eclipse.org/xtext/common/JavaVMTypes" as types
import "http://www.eclipse.org/xtext/xbase/Xbase" as xbase
MyClass returns MyClass:
{MyClass}
'MyClass'
'{'
('ref' ref=JvmTypeReference)?
('body' body=XBlockExpression)?
'}';
JvmTypeReference returns types::JvmTypeReference:
JvmParameterizedTypeReference_Impl | JvmGenericArrayTypeReference | JvmWildcardTypeReference | JvmAnyTypeReference | JvmMultiTypeReference | JvmDelegateTypeReference | JvmSynonymTypeReference | JvmUnknownTypeReference | JvmInnerTypeReference;
XExpression returns xbase::XExpression:
XIfExpression | XSwitchExpression | XBlockExpression | XVariableDeclaration | XMemberFeatureCall | XFeatureCall | XConstructorCall | XBooleanLiteral | XNullLiteral | XNumberLiteral | XStringLiteral | XListLiteral | XSetLiteral | XClosure | XCastedExpression | XBinaryOperation | XUnaryOperation | XPostfixOperation | XForLoopExpression | XBasicForLoopExpression | XDoWhileExpression | XWhileExpression | XTypeLiteral | XInstanceOfExpression | XThrowExpression | XTryCatchFinallyExpression | XAssignment | XReturnExpression | XSynchronizedExpression;
JvmType returns types::JvmType:
JvmVoid | JvmPrimitiveType | JvmArrayType | JvmTypeParameter | JvmAnnotationType | JvmEnumerationType | JvmGenericType;
JvmTypeConstraint returns types::JvmTypeConstraint:
JvmUpperBound | JvmLowerBound;
JvmParameterizedTypeReference returns types::JvmParameterizedTypeReference:
JvmParameterizedTypeReference_Impl | JvmInnerTypeReference;
JvmMember returns types::JvmMember:
JvmAnnotationType | JvmEnumerationType | JvmEnumerationLiteral | JvmGenericType | JvmField_Impl | JvmConstructor | JvmOperation;
JvmAnnotationValue returns types::JvmAnnotationValue:
JvmIntAnnotationValue | JvmBooleanAnnotationValue | JvmByteAnnotationValue | JvmShortAnnotationValue | JvmLongAnnotationValue | JvmDoubleAnnotationValue | JvmFloatAnnotationValue | JvmCharAnnotationValue | JvmStringAnnotationValue | JvmTypeAnnotationValue | JvmAnnotationAnnotationValue | JvmEnumAnnotationValue | JvmCustomAnnotationValue;
JvmIdentifiableElement returns types::JvmIdentifiableElement:
JvmVoid | JvmPrimitiveType | JvmArrayType | JvmTypeParameter | JvmAnnotationType | JvmEnumerationType | JvmEnumerationLiteral | JvmGenericType | JvmField_Impl | JvmConstructor | JvmOperation | JvmFormalParameter;
XBlockExpression returns xbase::XBlockExpression:
{xbase::XBlockExpression}
'XBlockExpression'
'{'
('expressions' '{' expressions+=XExpression ( "," expressions+=XExpression)* '}' )?
'}';
JvmParameterizedTypeReference_Impl returns types::JvmParameterizedTypeReference:
{types::JvmParameterizedTypeReference}
'JvmParameterizedTypeReference'
'{'
('type' type=[types::JvmType|EString])?
('arguments' '{' arguments+=JvmTypeReference ( "," arguments+=JvmTypeReference)* '}' )?
'}';
JvmGenericArrayTypeReference returns types::JvmGenericArrayTypeReference:
{types::JvmGenericArrayTypeReference}
'JvmGenericArrayTypeReference'
'{'
('componentType' componentType=JvmTypeReference)?
'}';
JvmWildcardTypeReference returns types::JvmWildcardTypeReference:
{types::JvmWildcardTypeReference}
'JvmWildcardTypeReference'
'{'
('constraints' '{' constraints+=JvmTypeConstraint ( "," constraints+=JvmTypeConstraint)* '}' )?
'}';
JvmAnyTypeReference returns types::JvmAnyTypeReference:
{types::JvmAnyTypeReference}
'JvmAnyTypeReference'
'{'
'}';
JvmMultiTypeReference returns types::JvmMultiTypeReference:
{types::JvmMultiTypeReference}
'JvmMultiTypeReference'
'{'
('references' '{' references+=JvmTypeReference ( "," references+=JvmTypeReference)* '}' )?
'}';
JvmDelegateTypeReference returns types::JvmDelegateTypeReference:
{types::JvmDelegateTypeReference}
'JvmDelegateTypeReference'
'{'
('delegate' delegate=[types::JvmTypeReference|EString])?
'}';
JvmSynonymTypeReference returns types::JvmSynonymTypeReference:
{types::JvmSynonymTypeReference}
'JvmSynonymTypeReference'
'{'
'}';
JvmUnknownTypeReference returns types::JvmUnknownTypeReference:
{types::JvmUnknownTypeReference}
'JvmUnknownTypeReference'
;
JvmInnerTypeReference returns types::JvmInnerTypeReference:
{types::JvmInnerTypeReference}
'JvmInnerTypeReference'
'{'
('outer' outer=JvmParameterizedTypeReference)?
'}';
JvmVoid returns types::JvmVoid:
{types::JvmVoid}
'JvmVoid'
;
JvmPrimitiveType returns types::JvmPrimitiveType:
{types::JvmPrimitiveType}
'JvmPrimitiveType'
'{'
('simpleName' simpleName=EString)?
('arrayType' arrayType=JvmArrayType)?
'}';
JvmArrayType returns types::JvmArrayType:
{types::JvmArrayType}
'JvmArrayType'
'{'
'}';
JvmTypeParameter returns types::JvmTypeParameter:
{types::JvmTypeParameter}
'JvmTypeParameter'
name=EString
'{'
'}';
JvmAnnotationType returns types::JvmAnnotationType:
{types::JvmAnnotationType}
(deprecated?='deprecated')?
(abstract?='abstract')?
(static?='static')?
(final?='final')?
'JvmAnnotationType'
'{'
('visibility' visibility=JvmVisibility)?
('packageName' packageName=EString)?
('annotations' '{' annotations+=JvmAnnotationReference ( "," annotations+=JvmAnnotationReference)* '}' )?
('superTypes' '{' superTypes+=JvmTypeReference ( "," superTypes+=JvmTypeReference)* '}' )?
('members' '{' members+=JvmMember ( "," members+=JvmMember)* '}' )?
'}';
JvmEnumerationType returns types::JvmEnumerationType:
{types::JvmEnumerationType}
(static?='static')?
(final?='final')?
'JvmEnumerationType'
'{'
'}';
JvmGenericType returns types::JvmGenericType:
{types::JvmGenericType}
(static?='static')?
(final?='final')?
(interface?='interface')?
(strictFloatingPoint?='strictFloatingPoint')?
(anonymous?='anonymous')?
'JvmGenericType'
'{'
('typeParameters' '{' typeParameters+=JvmTypeParameter ( "," typeParameters+=JvmTypeParameter)* '}' )?
'}';
EString returns ecore::EString:
STRING | ID;
JvmAnnotationReference returns types::JvmAnnotationReference:
{types::JvmAnnotationReference}
'JvmAnnotationReference'
'{'
('annotation' annotation=[types::JvmAnnotationType|EString])?
('explicitValues' '{' explicitValues+=JvmAnnotationValue ( "," explicitValues+=JvmAnnotationValue)* '}' )?
'}';
enum JvmVisibility returns types::JvmVisibility:
DEFAULT = 'DEFAULT' | PRIVATE = 'PRIVATE' | PROTECTED = 'PROTECTED' | PUBLIC = 'PUBLIC';
EBoolean returns ecore::EBoolean:
'true' | 'false';
JvmOperation returns types::JvmOperation:
{types::JvmOperation}
(varArgs?='varArgs')?
(static?='static')?
(final?='final')?
(synchronized?='synchronized')?
(default?='default')?
(native?='native')?
'JvmOperation'
'{'
('localClasses' '{' localClasses+=JvmGenericType ( "," localClasses+=JvmGenericType)* '}' )?
('parameters' '{' parameters+=JvmFormalParameter ( "," parameters+=JvmFormalParameter)* '}' )?
('exceptions' '{' exceptions+=JvmTypeReference ( "," exceptions+=JvmTypeReference)* '}' )?
('returnType' returnType=JvmTypeReference)?
('defaultValue' defaultValue=JvmAnnotationValue)?
'}';
JvmIntAnnotationValue returns types::JvmIntAnnotationValue:
{types::JvmIntAnnotationValue}
'JvmIntAnnotationValue'
'{'
('values' '{' values+=EInt ( "," values+=EInt)* '}' )?
('operation' operation=[types::JvmOperation|EString])?
'}';
JvmBooleanAnnotationValue returns types::JvmBooleanAnnotationValue:
{types::JvmBooleanAnnotationValue}
'JvmBooleanAnnotationValue'
'{'
('values' '{' values+=EBoolean ( "," values+=EBoolean)* '}' )?
'}';
JvmByteAnnotationValue returns types::JvmByteAnnotationValue:
{types::JvmByteAnnotationValue}
'JvmByteAnnotationValue'
'{'
('values' '{' values+=EByte ( "," values+=EByte)* '}' )?
'}';
JvmShortAnnotationValue returns types::JvmShortAnnotationValue:
{types::JvmShortAnnotationValue}
'JvmShortAnnotationValue'
'{'
('values' '{' values+=EShort ( "," values+=EShort)* '}' )?
'}';
JvmLongAnnotationValue returns types::JvmLongAnnotationValue:
{types::JvmLongAnnotationValue}
'JvmLongAnnotationValue'
'{'
('values' '{' values+=ELong ( "," values+=ELong)* '}' )?
'}';
JvmDoubleAnnotationValue returns types::JvmDoubleAnnotationValue:
{types::JvmDoubleAnnotationValue}
'JvmDoubleAnnotationValue'
'{'
('values' '{' values+=EDouble ( "," values+=EDouble)* '}' )?
'}';
JvmFloatAnnotationValue returns types::JvmFloatAnnotationValue:
{types::JvmFloatAnnotationValue}
'JvmFloatAnnotationValue'
'{'
('values' '{' values+=EFloat ( "," values+=EFloat)* '}' )?
'}';
JvmCharAnnotationValue returns types::JvmCharAnnotationValue:
{types::JvmCharAnnotationValue}
'JvmCharAnnotationValue'
'{'
('values' '{' values+=EChar ( "," values+=EChar)* '}' )?
'}';
JvmStringAnnotationValue returns types::JvmStringAnnotationValue:
{types::JvmStringAnnotationValue}
'JvmStringAnnotationValue'
'{'
('values' '{' values+=EString ( "," values+=EString)* '}' )?
'}';
JvmTypeAnnotationValue returns types::JvmTypeAnnotationValue:
{types::JvmTypeAnnotationValue}
'JvmTypeAnnotationValue'
'{'
('values' '{' values+=JvmTypeReference ( "," values+=JvmTypeReference)* '}' )?
'}';
JvmAnnotationAnnotationValue returns types::JvmAnnotationAnnotationValue:
{types::JvmAnnotationAnnotationValue}
'JvmAnnotationAnnotationValue'
'{'
('values' '{' values+=JvmAnnotationReference ( "," values+=JvmAnnotationReference)* '}' )?
'}';
JvmEnumAnnotationValue returns types::JvmEnumAnnotationValue:
{types::JvmEnumAnnotationValue}
'JvmEnumAnnotationValue'
'{'
('values' '(' values+=[types::JvmEnumerationLiteral|EString] ( "," values+=[types::JvmEnumerationLiteral|EString])* ')' )?
'}';
JvmCustomAnnotationValue returns types::JvmCustomAnnotationValue:
{types::JvmCustomAnnotationValue}
'JvmCustomAnnotationValue'
'{'
('values' '(' values+=[ecore::EObject|EString] ( "," values+=[ecore::EObject|EString])* ')' )?
'}';
JvmFormalParameter returns types::JvmFormalParameter:
{types::JvmFormalParameter}
'JvmFormalParameter'
name=EString
'{'
('parameterType' parameterType=JvmTypeReference)?
'}';
EInt returns ecore::EInt:
'-'? INT;
EByte returns ecore::EByte:
'-'? INT;
EShort returns ecore::EShort:
'-'? INT;
ELong returns ecore::ELong:
'-'? INT;
EDouble returns ecore::EDouble:
'-'? INT? '.' INT (('E'|'e') '-'? INT)?;
EFloat returns ecore::EFloat:
'-'? INT? '.' INT (('E'|'e') '-'? INT)?;
EChar returns ecore::EChar:
'-'? INT;
JvmEnumerationLiteral returns types::JvmEnumerationLiteral:
{types::JvmEnumerationLiteral}
(static?='static')?
(final?='final')?
(volatile?='volatile')?
(transient?='transient')?
(constant?='constant')?
'JvmEnumerationLiteral'
'{'
('constantValue' constantValue=EJavaObject)?
('type' type=JvmTypeReference)?
'}';
EJavaObject returns ecore::EJavaObject:
'EJavaObject' /* TODO: implement this rule and an appropriate IValueConverter */;
EObject returns ecore::EObject:
{ecore::EObject}
'EObject'
;
JvmField_Impl returns types::JvmField:
{types::JvmField}
(static?='static')?
(final?='final')?
'JvmField'
'{'
'}';
JvmConstructor returns types::JvmConstructor:
{types::JvmConstructor}
'JvmConstructor'
'{'
'}';
JvmUpperBound returns types::JvmUpperBound:
{types::JvmUpperBound}
'JvmUpperBound'
'{'
('typeReference' typeReference=JvmTypeReference)?
'}';
JvmLowerBound returns types::JvmLowerBound:
{types::JvmLowerBound}
'JvmLowerBound'
'{'
'}';
XIfExpression returns xbase::XIfExpression:
{xbase::XIfExpression}
'XIfExpression'
'{'
('if' if=XExpression)?
('then' then=XExpression)?
('else' else=XExpression)?
'}';
XSwitchExpression returns xbase::XSwitchExpression:
{xbase::XSwitchExpression}
'XSwitchExpression'
'{'
('switch' switch=XExpression)?
('cases' '{' cases+=XCasePart ( "," cases+=XCasePart)* '}' )?
('default' default=XExpression)?
('declaredParam' declaredParam=JvmFormalParameter)?
'}';
XVariableDeclaration returns xbase::XVariableDeclaration:
{xbase::XVariableDeclaration}
(writeable?='writeable')?
'XVariableDeclaration'
name=EString
'{'
('right' right=XExpression)?
'}';
XMemberFeatureCall returns xbase::XMemberFeatureCall:
{xbase::XMemberFeatureCall}
(explicitOperationCall?='explicitOperationCall')?
(explicitStatic?='explicitStatic')?
(nullSafe?='nullSafe')?
'XMemberFeatureCall'
'{'
('feature' feature=[types::JvmIdentifiableElement|EString])?
('typeArguments' '{' typeArguments+=JvmTypeReference ( "," typeArguments+=JvmTypeReference)* '}' )?
('memberCallTarget' memberCallTarget=XExpression)?
('memberCallArguments' '{' memberCallArguments+=XExpression ( "," memberCallArguments+=XExpression)* '}' )?
'}';
XFeatureCall returns xbase::XFeatureCall:
{xbase::XFeatureCall}
'XFeatureCall'
'{'
('featureCallArguments' '{' featureCallArguments+=XExpression ( "," featureCallArguments+=XExpression)* '}' )?
'}';
XConstructorCall returns xbase::XConstructorCall:
{xbase::XConstructorCall}
(explicitConstructorCall?='explicitConstructorCall')?
'XConstructorCall'
'{'
('constructor' constructor=[types::JvmConstructor|EString])?
('arguments' '{' arguments+=XExpression ( "," arguments+=XExpression)* '}' )?
'}';
XBooleanLiteral returns xbase::XBooleanLiteral:
{xbase::XBooleanLiteral}
(isTrue?='isTrue')?
'XBooleanLiteral'
;
XNullLiteral returns xbase::XNullLiteral:
{xbase::XNullLiteral}
'XNullLiteral'
;
XNumberLiteral returns xbase::XNumberLiteral:
{xbase::XNumberLiteral}
'XNumberLiteral'
'{'
('value' value=EString)?
'}';
XStringLiteral returns xbase::XStringLiteral:
{xbase::XStringLiteral}
'XStringLiteral'
'{'
'}';
XListLiteral returns xbase::XListLiteral:
{xbase::XListLiteral}
'XListLiteral'
'{'
('elements' '{' elements+=XExpression ( "," elements+=XExpression)* '}' )?
'}';
XSetLiteral returns xbase::XSetLiteral:
{xbase::XSetLiteral}
'XSetLiteral'
'{'
'}';
XClosure returns xbase::XClosure:
{xbase::XClosure}
(explicitSyntax?='explicitSyntax')?
'XClosure'
'{'
('declaredFormalParameters' '{' declaredFormalParameters+=JvmFormalParameter ( "," declaredFormalParameters+=JvmFormalParameter)* '}' )?
('expression' expression=XExpression)?
'}';
XCastedExpression returns xbase::XCastedExpression:
{xbase::XCastedExpression}
'XCastedExpression'
'{'
('target' target=XExpression)?
'}';
XBinaryOperation returns xbase::XBinaryOperation:
{xbase::XBinaryOperation}
(reassignFirstArgument?='reassignFirstArgument')?
'XBinaryOperation'
'{'
('leftOperand' leftOperand=XExpression)?
('rightOperand' rightOperand=XExpression)?
'}';
XUnaryOperation returns xbase::XUnaryOperation:
{xbase::XUnaryOperation}
'XUnaryOperation'
'{'
('operand' operand=XExpression)?
'}';
XPostfixOperation returns xbase::XPostfixOperation:
{xbase::XPostfixOperation}
'XPostfixOperation'
'{'
'}';
XForLoopExpression returns xbase::XForLoopExpression:
{xbase::XForLoopExpression}
'XForLoopExpression'
'{'
('forExpression' forExpression=XExpression)?
('eachExpression' eachExpression=XExpression)?
'}';
XBasicForLoopExpression returns xbase::XBasicForLoopExpression:
{xbase::XBasicForLoopExpression}
'XBasicForLoopExpression'
'{'
('initExpressions' '{' initExpressions+=XExpression ( "," initExpressions+=XExpression)* '}' )?
('updateExpressions' '{' updateExpressions+=XExpression ( "," updateExpressions+=XExpression)* '}' )?
'}';
XDoWhileExpression returns xbase::XDoWhileExpression:
{xbase::XDoWhileExpression}
'XDoWhileExpression'
'{'
('predicate' predicate=XExpression)?
('body' body=XExpression)?
'}';
XWhileExpression returns xbase::XWhileExpression:
{xbase::XWhileExpression}
'XWhileExpression'
'{'
'}';
XTypeLiteral returns xbase::XTypeLiteral:
'XTypeLiteral'
'{'
('arrayDimensions' '{' arrayDimensions+=EString ( "," arrayDimensions+=EString)* '}' )?
'type' type=[types::JvmType|EString]
'}';
XInstanceOfExpression returns xbase::XInstanceOfExpression:
'XInstanceOfExpression'
'{'
'type' type=JvmTypeReference
'expression' expression=XExpression
'}';
XThrowExpression returns xbase::XThrowExpression:
{xbase::XThrowExpression}
'XThrowExpression'
'{'
'}';
XTryCatchFinallyExpression returns xbase::XTryCatchFinallyExpression:
{xbase::XTryCatchFinallyExpression}
'XTryCatchFinallyExpression'
'{'
('finallyExpression' finallyExpression=XExpression)?
('catchClauses' '{' catchClauses+=XCatchClause ( "," catchClauses+=XCatchClause)* '}' )?
'}';
XAssignment returns xbase::XAssignment:
{xbase::XAssignment}
'XAssignment'
'{'
('assignable' assignable=XExpression)?
('value' value=XExpression)?
'}';
Rebuilds Xbase grammar without reusing it…

Wizard does crazy things…// automatically generated by Xtext
import "http://www.xtext.org/example/xbase"
import "http://www.eclipse.org/xtext/common/JavaVMTypes" as types
import "http://www.eclipse.org/xtext/xbase/Xbase" as xbase
MyClass returns MyClass:
{MyClass}
'MyClass'
'{'
('ref' ref=JvmTypeReference)?
('body' body=XBlockExpression)?
'}';
JvmTypeReference returns types::JvmTypeReference:
JvmParameterizedTypeReference_Impl | JvmGenericArrayTypeReference | JvmWildcardTypeReference | JvmAnyTypeReference | JvmMultiTypeReference | JvmDelegateTypeReference | JvmSynonymTypeReference | JvmUnknownTypeReference | JvmInnerTypeReference;
XExpression returns xbase::XExpression:
XIfExpression | XSwitchExpression | XBlockExpression | XVariableDeclaration | XMemberFeatureCall | XFeatureCall | XConstructorCall | XBooleanLiteral | XNullLiteral | XNumberLiteral | XStringLiteral | XListLiteral | XSetLiteral | XClosure | XCastedExpression | XBinaryOperation | XUnaryOperation | XPostfixOperation | XForLoopExpression | XBasicForLoopExpression | XDoWhileExpression | XWhileExpression | XTypeLiteral | XInstanceOfExpression | XThrowExpression | XTryCatchFinallyExpression | XAssignment | XReturnExpression | XSynchronizedExpression;
JvmType returns types::JvmType:
JvmVoid | JvmPrimitiveType | JvmArrayType | JvmTypeParameter | JvmAnnotationType | JvmEnumerationType | JvmGenericType;
JvmTypeConstraint returns types::JvmTypeConstraint:
JvmUpperBound | JvmLowerBound;
JvmParameterizedTypeReference returns types::JvmParameterizedTypeReference:
JvmParameterizedTypeReference_Impl | JvmInnerTypeReference;
JvmMember returns types::JvmMember:
JvmAnnotationType | JvmEnumerationType | JvmEnumerationLiteral | JvmGenericType | JvmField_Impl | JvmConstructor | JvmOperation;
JvmAnnotationValue returns types::JvmAnnotationValue:
JvmIntAnnotationValue | JvmBooleanAnnotationValue | JvmByteAnnotationValue | JvmShortAnnotationValue | JvmLongAnnotationValue | JvmDoubleAnnotationValue | JvmFloatAnnotationValue | JvmCharAnnotationValue | JvmStringAnnotationValue | JvmTypeAnnotationValue | JvmAnnotationAnnotationValue | JvmEnumAnnotationValue | JvmCustomAnnotationValue;
JvmIdentifiableElement returns types::JvmIdentifiableElement:
JvmVoid | JvmPrimitiveType | JvmArrayType | JvmTypeParameter | JvmAnnotationType | JvmEnumerationType | JvmEnumerationLiteral | JvmGenericType | JvmField_Impl | JvmConstructor | JvmOperation | JvmFormalParameter;
XBlockExpression returns xbase::XBlockExpression:
{xbase::XBlockExpression}
'XBlockExpression'
'{'
('expressions' '{' expressions+=XExpression ( "," expressions+=XExpression)* '}' )?
'}';
JvmParameterizedTypeReference_Impl returns types::JvmParameterizedTypeReference:
{types::JvmParameterizedTypeReference}
'JvmParameterizedTypeReference'
'{'
'}';
JvmGenericArrayTypeReference returns types::JvmGenericArrayTypeReference:
{types::JvmGenericArrayTypeReference}
'JvmGenericArrayTypeReference'
'{'
('componentType' componentType=JvmTypeReference)?
'}';
JvmWildcardTypeReference returns types::JvmWildcardTypeReference:
{types::JvmWildcardTypeReference}
'JvmWildcardTypeReference'
'{'
'}';
JvmAnyTypeReference returns types::JvmAnyTypeReference:
{types::JvmAnyTypeReference}
'JvmAnyTypeReference'
'{'
'}';
JvmMultiTypeReference returns types::JvmMultiTypeReference:
{types::JvmMultiTypeReference}
'JvmMultiTypeReference'
'{'
'}';
JvmDelegateTypeReference returns types::JvmDelegateTypeReference:
{types::JvmDelegateTypeReference}
'JvmDelegateTypeReference'
'{'
('delegate' delegate=[types::JvmTypeReference|EString])?
'}';
JvmSynonymTypeReference returns types::JvmSynonymTypeReference:
{types::JvmSynonymTypeReference}
'JvmSynonymTypeReference'
'{'
'}';
JvmUnknownTypeReference returns types::JvmUnknownTypeReference:
{types::JvmUnknownTypeReference}
'JvmUnknownTypeReference'
;
JvmInnerTypeReference returns types::JvmInnerTypeReference:
{types::JvmInnerTypeReference}
'JvmInnerTypeReference'
'{'
('outer' outer=JvmParameterizedTypeReference)?
'}';
JvmVoid returns types::JvmVoid:
{types::JvmVoid}
'JvmVoid'
;
JvmPrimitiveType returns types::JvmPrimitiveType:
{types::JvmPrimitiveType}
'JvmPrimitiveType'
'{'
'}';
JvmArrayType returns types::JvmArrayType:
{types::JvmArrayType}
'JvmArrayType'
'{'
'}';
JvmTypeParameter returns types::JvmTypeParameter:
{types::JvmTypeParameter}
'JvmTypeParameter'
name=EString
'{'
'}';
JvmAnnotationType returns types::JvmAnnotationType:
{types::JvmAnnotationType}
(static?='static')?
(final?='final')?
'JvmAnnotationType'
'{'
'}';
JvmEnumerationType returns types::JvmEnumerationType:
{types::JvmEnumerationType}
(static?='static')?
(final?='final')?
'JvmEnumerationType'
'{'
'}';
JvmGenericType returns types::JvmGenericType:
{types::JvmGenericType}
(static?='static')?
(final?='final')?
(interface?='interface')?
(anonymous?='anonymous')?
'JvmGenericType'
'{'
'}';
EString returns ecore::EString:
STRING | ID;
JvmAnnotationReference returns types::JvmAnnotationReference:
{types::JvmAnnotationReference}
'JvmAnnotationReference'
'{'
('annotation' annotation=[types::JvmAnnotationType|EString])?
('explicitValues' '{' explicitValues+=JvmAnnotationValue ( "," explicitValues+=JvmAnnotationValue)* '}' )?
'}';
enum JvmVisibility returns types::JvmVisibility:
DEFAULT = 'DEFAULT' | PRIVATE = 'PRIVATE' | PROTECTED = 'PROTECTED' | PUBLIC = 'PUBLIC';
EBoolean returns ecore::EBoolean:
'true' | 'false';
JvmOperation returns types::JvmOperation:
{types::JvmOperation}
(static?='static')?
(final?='final')?
(synchronized?='synchronized')?
(default?='default')?
(native?='native')?
'JvmOperation'
'{'
('returnType' returnType=JvmTypeReference)?
('defaultValue' defaultValue=JvmAnnotationValue)?
'}';
JvmIntAnnotationValue returns types::JvmIntAnnotationValue:
{types::JvmIntAnnotationValue}
'JvmIntAnnotationValue'
'{'
('values' '{' values+=EInt ( "," values+=EInt)* '}' )?
'}';
JvmBooleanAnnotationValue returns types::JvmBooleanAnnotationValue:
{types::JvmBooleanAnnotationValue}
'JvmBooleanAnnotationValue'
'{'
('values' '{' values+=EBoolean ( "," values+=EBoolean)* '}' )?
'}';
JvmByteAnnotationValue returns types::JvmByteAnnotationValue:
{types::JvmByteAnnotationValue}
'JvmByteAnnotationValue'
'{'
('values' '{' values+=EByte ( "," values+=EByte)* '}' )?
'}';
JvmShortAnnotationValue returns types::JvmShortAnnotationValue:
{types::JvmShortAnnotationValue}
'JvmShortAnnotationValue'
'{'
('values' '{' values+=EShort ( "," values+=EShort)* '}' )?
'}';
JvmLongAnnotationValue returns types::JvmLongAnnotationValue:
{types::JvmLongAnnotationValue}
'JvmLongAnnotationValue'
'{'
('values' '{' values+=ELong ( "," values+=ELong)* '}' )?
'}';
JvmDoubleAnnotationValue returns types::JvmDoubleAnnotationValue:
{types::JvmDoubleAnnotationValue}
'JvmDoubleAnnotationValue'
'{'
('values' '{' values+=EDouble ( "," values+=EDouble)* '}' )?
'}';
JvmFloatAnnotationValue returns types::JvmFloatAnnotationValue:
{types::JvmFloatAnnotationValue}
'JvmFloatAnnotationValue'
'{'
('values' '{' values+=EFloat ( "," values+=EFloat)* '}' )?
'}';
JvmCharAnnotationValue returns types::JvmCharAnnotationValue:
{types::JvmCharAnnotationValue}
'JvmCharAnnotationValue'
'{'
('values' '{' values+=EChar ( "," values+=EChar)* '}' )?
'}';
JvmStringAnnotationValue returns types::JvmStringAnnotationValue:
{types::JvmStringAnnotationValue}
'JvmStringAnnotationValue'
'{'
('values' '{' values+=EString ( "," values+=EString)* '}' )?
'}';
JvmTypeAnnotationValue returns types::JvmTypeAnnotationValue:
{types::JvmTypeAnnotationValue}
'JvmTypeAnnotationValue'
'{'
('values' '{' values+=JvmTypeReference ( "," values+=JvmTypeReference)* '}' )?
'}';
JvmAnnotationAnnotationValue returns types::JvmAnnotationAnnotationValue:
{types::JvmAnnotationAnnotationValue}
'JvmAnnotationAnnotationValue'
'{'
('values' '{' values+=JvmAnnotationReference ( "," values+=JvmAnnotationReference)* '}' )?
'}';
JvmEnumAnnotationValue returns types::JvmEnumAnnotationValue:
{types::JvmEnumAnnotationValue}
'JvmEnumAnnotationValue'
'{'
('values' '(' values+=[types::JvmEnumerationLiteral|EString] ( "," values+=[types::JvmEnumerationLiteral|EString])* ')' )?
'}';
JvmCustomAnnotationValue returns types::JvmCustomAnnotationValue:
{types::JvmCustomAnnotationValue}
'JvmCustomAnnotationValue'
'{'
('values' '(' values+=[ecore::EObject|EString] ( "," values+=[ecore::EObject|EString])* ')' )?
'}';
JvmFormalParameter returns types::JvmFormalParameter:
{types::JvmFormalParameter}
'JvmFormalParameter'
name=EString
'{'
('parameterType' parameterType=JvmTypeReference)?
'}';
EInt returns ecore::EInt:
'-'? INT;
EByte returns ecore::EByte:
'-'? INT;
EShort returns ecore::EShort:
'-'? INT;
ELong returns ecore::ELong:
'-'? INT;
EDouble returns ecore::EDouble:
'-'? INT? '.' INT (('E'|'e') '-'? INT)?;
EFloat returns ecore::EFloat:
'-'? INT? '.' INT (('E'|'e') '-'? INT)?;
EChar returns ecore::EChar:
'-'? INT;
JvmEnumerationLiteral returns types::JvmEnumerationLiteral:
{types::JvmEnumerationLiteral}
(static?='static')?
(final?='final')?
'JvmEnumerationLiteral'
'{'
'}';
EJavaObject returns ecore::EJavaObject:
'EJavaObject' /* TODO: implement this rule and an appropriate IValueConverter */;
EObject returns ecore::EObject:
{ecore::EObject}
'EObject'
;
JvmField_Impl returns types::JvmField:
{types::JvmField}
(static?='static')?
(final?='final')?
'JvmField'
'{'
'}';
JvmConstructor returns types::JvmConstructor:
{types::JvmConstructor}
'JvmConstructor'
'{'
'}';
JvmUpperBound returns types::JvmUpperBound:
{types::JvmUpperBound}
'JvmUpperBound'
'{'
'}';
JvmLowerBound returns types::JvmLowerBound:
{types::JvmLowerBound}
'JvmLowerBound'
'{'
'}';
XIfExpression returns xbase::XIfExpression:
{xbase::XIfExpression}
'XIfExpression'
'{'
('if' if=XExpression)?
('then' then=XExpression)?
('else' else=XExpression)?
'}';
XSwitchExpression returns xbase::XSwitchExpression:
{xbase::XSwitchExpression}
'XSwitchExpression'
'{'
('switch' switch=XExpression)?
('cases' '{' cases+=XCasePart ( "," cases+=XCasePart)* '}' )?
('default' default=XExpression)?
'}';
XVariableDeclaration returns xbase::XVariableDeclaration:
{xbase::XVariableDeclaration}
(writeable?='writeable')?
'XVariableDeclaration'
name=EString
'{'
('right' right=XExpression)?
'}';
XMemberFeatureCall returns xbase::XMemberFeatureCall:
{xbase::XMemberFeatureCall}
(nullSafe?='nullSafe')?
'XMemberFeatureCall'
'{'
('memberCallTarget' memberCallTarget=XExpression)?
('memberCallArguments' '{' memberCallArguments+=XExpression ( "," memberCallArguments+=XExpression)* '}' )?
'}';
XFeatureCall returns xbase::XFeatureCall:
{xbase::XFeatureCall}
'XFeatureCall'
'{'
('featureCallArguments' '{' featureCallArguments+=XExpression ( "," featureCallArguments+=XExpression)* '}' )?
'}';
XConstructorCall returns xbase::XConstructorCall:
{xbase::XConstructorCall}
(explicitConstructorCall?='explicitConstructorCall')?
'XConstructorCall'
'{'
('constructor' constructor=[types::JvmConstructor|EString])?
('arguments' '{' arguments+=XExpression ( "," arguments+=XExpression)* '}' )?
'}';
XBooleanLiteral returns xbase::XBooleanLiteral:
{xbase::XBooleanLiteral}
(isTrue?='isTrue')?
'XBooleanLiteral'
;
XNullLiteral returns xbase::XNullLiteral:
{xbase::XNullLiteral}
'XNullLiteral'
;
XNumberLiteral returns xbase::XNumberLiteral:
{xbase::XNumberLiteral}
'XNumberLiteral'
'{'
'}';
XStringLiteral returns xbase::XStringLiteral:
{xbase::XStringLiteral}
'XStringLiteral'
'{'
'}';
XListLiteral returns xbase::XListLiteral:
{xbase::XListLiteral}
'XListLiteral'
'{'
'}';
XSetLiteral returns xbase::XSetLiteral:
{xbase::XSetLiteral}
'XSetLiteral'
'{'
'}';
XClosure returns xbase::XClosure:
{xbase::XClosure}
(explicitSyntax?='explicitSyntax')?
'XClosure'
'{'
('declaredFormalParameters' '{' declaredFormalParameters+=JvmFormalParameter ( "," declaredFormalParameters+=JvmFormalParameter)* '}' )?
'}';
XCastedExpression returns xbase::XCastedExpression:
{xbase::XCastedExpression}
'XCastedExpression'
'{'
('target' target=XExpression)?
'}';
XBinaryOperation returns xbase::XBinaryOperation:
{xbase::XBinaryOperation}
(reassignFirstArgument?='reassignFirstArgument')?
'XBinaryOperation'
'{'
('leftOperand' leftOperand=XExpression)?
('rightOperand' rightOperand=XExpression)?
'}';
XUnaryOperation returns xbase::XUnaryOperation:
{xbase::XUnaryOperation}
'XUnaryOperation'
'{'
'}';
XPostfixOperation returns xbase::XPostfixOperation:
{xbase::XPostfixOperation}
'XPostfixOperation'
'{'
'}';
XForLoopExpression returns xbase::XForLoopExpression:
{xbase::XForLoopExpression}
'XForLoopExpression'
'{'
('forExpression' forExpression=XExpression)?
'}';
XBasicForLoopExpression returns xbase::XBasicForLoopExpression:
{xbase::XBasicForLoopExpression}
'XBasicForLoopExpression'
'{'
('initExpressions' '{' initExpressions+=XExpression ( "," initExpressions+=XExpression)* '}' )?
('updateExpressions' '{' updateExpressions+=XExpression ( "," updateExpressions+=XExpression)* '}' )?
'}';
XDoWhileExpression returns xbase::XDoWhileExpression:
{xbase::XDoWhileExpression}
'XDoWhileExpression'
'{'
'}';
XWhileExpression returns xbase::XWhileExpression:
{xbase::XWhileExpression}
'XWhileExpression'
'{'
'}';
XTypeLiteral returns xbase::XTypeLiteral:
'XTypeLiteral'
'{'
('arrayDimensions' '{' arrayDimensions+=EString ( "," arrayDimensions+=EString)* '}' )?
'type' type=[types::JvmType|EString]
'}';
XInstanceOfExpression returns xbase::XInstanceOfExpression:
'XInstanceOfExpression'
'{'
'type' type=JvmTypeReference
'expression' expression=XExpression
'}';
XThrowExpression returns xbase::XThrowExpression:
{xbase::XThrowExpression}
'XThrowExpression'
'{'
'}';
XTryCatchFinallyExpression returns xbase::XTryCatchFinallyExpression:
{xbase::XTryCatchFinallyExpression}
'XTryCatchFinallyExpression'
'{'
('finallyExpression' finallyExpression=XExpression)?
('catchClauses' '{' catchClauses+=XCatchClause ( "," catchClauses+=XCatchClause)* '}' )?
'}';
XAssignment returns xbase::XAssignment:
{xbase::XAssignment}
'XAssignment'
'{'
('assignable' assignable=XExpression)?
('value' value=XExpression)?
'}';
Generator wrongly configured

I am missing the Maven part…

https://github.com/holgerschill/XtextCon_Xcore_Maven
A full working example can be found here
Tycho
Xtext Maven Plugin
Exec-Maven-Plugin
Xtend Maven Plugin

Pittfalls
<plugin>
<groupId>org.eclipse.xtext</groupId>
<artifactId>xtext-maven-plugin</artifactId>
<version>${xtext-version}</version>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
<configuration>
<languages>
<language>
<setup>org.eclipse.xtext.ecore.EcoreSupport</setup>
</language>
<language>
<setup>org.eclipse.emf.codegen.ecore.xtext.GenModelSupport</setup>
</language>
<language>
<setup>org.eclipse.emf.ecore.xcore.XcoreStandaloneSetup</setup>
</language>
</languages>
<sourceRoots>
<root>${project.basedir}/model</root>
</sourceRoots>
</configuration>
Register right languages for Xcore

Pittfalls
Right dependencies to generate Java out of Xcore
<dependencies>
<dependency>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.core</artifactId>
<version>4.3.1</version>
</dependency>
<dependency>
<groupId>org.eclipse.core</groupId>
<artifactId>org.eclipse.core.resources</artifactId>
</dependency>
<dependency>
<groupId>org.eclipse.text</groupId>
<artifactId>org.eclipse.text</artifactId>
</dependency>
<dependency>
<groupId>org.eclipse.emf</groupId>
<artifactId>org.eclipse.emf.codegen.ecore.xtext</artifactId>
<version>${ecore-xtext-version}</version>
</dependency>
<dependency>
<artifactId>org.eclipse.emf.ecore.xcore.lib</artifactId>
<version>${ecore-xcore-lib-version}</version>
</dependency>
<dependency>
<artifactId>org.eclipse.emf.ecore.xcore</artifactId>
<version>${ecore-xcore-version}</version>
</dependency>
</dependencies>

Pittfalls
Set modelDirectory in Xcore files explicitly
@GenModel(modelDirectory="./src-gen")
package org.xtext.example.myfirstdsl
import common.NamedElement
import common.Referenceable
class FirstElement extends NamedElement, Referenceable {
refers Referenceable ref
}

Pittfalls
Don’t use classpath URIs in MWE2
var fileExtensions = "first"
var projectName = "org.xtext.example.firstdsl.lang"
var runtimeProject = "../${projectName}"
var generateXtendStub = true
//var grammarURI = "classpath:/org/xtext/example/firstdsl/Lang.xtext"
var grammarURI = "platform:/resource/${projectName}/src/org/xtext/example/firstdsl/Lang.xtext"

Pittfalls
Explicitly set path to generate Java classes
// generates Java API for the generated EPackages
fragment = ecore.EMFGeneratorFragment auto-inject {
javaModelDirectory = "/${projectName}/src-gen"
}

Using Xcore with Xtext

Recommended

More Related Content

What's hot (20)

Viewers also liked (20)

Similar to Using Xcore with Xtext (20)

Recently uploaded (20)

Using Xcore with Xtext