XText: permit invalid cross reference

XText: permit invalid cross reference

References

Reference NO 1

http://stackoverflow.com/questions/13634242/xtext-permit-invalid-cross-reference

Reference NO 2

http://stackoverflow.com/questions/14449040/xtext-cross-references-with-alternative

Reference NO 3

http://stackoverflow.com/questions/14539985/xtext-dsl-grammar-scoping-customization

Reference NO 4

http://stackoverflow.com/questions/11693120/xtext-cross-referencing-and-scoping

Reference NO 5

http://stackoverflow.com/questions/5849593/cross-referencing-dsl-elements-in-xtext-from-a-jar

Reference NO 6

http://blogs.itemis.de/stundzig/archives/category/eclipse/tmf/xtext/page/3

Reference NO 7

#EANF#

Reference NO 8

#EANF#