https://download.eclipse.org/modeling/mdt/ocl/javadoc/4.0.0/org/eclipse/ocl/examples/xtext/essentialocl/parser/antlr/internal/InternalEssentialOCLLexer.html
InternalEssentialOCLLexer (MDT-OCL Documentation)
mdtocldocumentation
https://download.eclipse.org/ocl/javadoc/6.4.0/org/eclipse/ocl/xtext/essentialocl/parser/antlr/internal/InternalEssentialOCLLexer.html
InternalEssentialOCLLexer