Model: cs+=Company* employees+=Emp* block+=Block
; 

Block:
	ref=[empId|QName]
;

QName : ID (":" ID)*;

Company: c='Company' name=ID '{' emp+=Emp+ '}';

Emp: r='Emp' name=ID '{' empIdName+= empId* '}'';' ; 
empId: 'Employee_id' name=ID;

public class MyDslRuntimeModule extends org.xtext.example.mydsl.AbstractMyDslRuntimeModule {

	public Class<? extends IQualifiedNameConverter> bindIQualifiedNameConverter() {
		return MyQNC.class;
	}
}

public class MyQNC extends IQualifiedNameConverter.DefaultImpl{
	
	@Override
	public String getDelimiter() {
		return ":";
	}

}

public class MyQNC extends IQualifiedNameConverter.DefaultImpl{
	
	@Override
	public String getDelimiter() {
		return ":";
	}
	
	@Override
	public QualifiedName toQualifiedName(String qualifiedNameAsString) {
		return super.toQualifiedName(qualifiedNameAsString.replaceAll(" ", ""));
	}

}