Expression:
  TerminalExpression ('.' ID '.' ID)? |
  TerminalExpression ('.' ID '.' ID actualParams=ActualParameters)?
;

TerminalExpression returns Expression:
  'this' |
  'null' |
  'false' |
  'true ' |
  STRING_LITERAL |
  NUMBER_LITERAL |
  ID |
  objectCreation=ObjectCreation |
  'super' actualParams=ActualParameters |
  '(' expr=Expression ')'
;

error(211): ../magda.xtext.Magda/src-gen/magda/xtext/parser/antlr/internal/InternalMagda.g:801:1: [fatal] rule ruleExpression has non-LL(*) decision due to recursive rule invocations reachable from alts 1,2.  Resolve by left-factoring or using syntactic predicates or using backtrack=true option.
warning(200): ../magda.xtext.Magda/src-gen/magda/xtext/parser/antlr/internal/InternalMagda.g:801:1: Decision can match input such as "'this'" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
warning(200): ../magda.xtext.Magda/src-gen/magda/xtext/parser/antlr/internal/InternalMagda.g:801:1: Decision can match input such as "'null'" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
warning(200): ../magda.xtext.Magda/src-gen/magda/xtext/parser/antlr/internal/InternalMagda.g:801:1: Decision can match input such as "'false'" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
warning(200): ../magda.xtext.Magda/src-gen/magda/xtext/parser/antlr/internal/InternalMagda.g:801:1: Decision can match input such as "RULE_ID" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
warning(200): ../magda.xtext.Magda/src-gen/magda/xtext/parser/antlr/internal/InternalMagda.g:801:1: Decision can match input such as "RULE_NUMBER_LITERAL" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
warning(200): ../magda.xtext.Magda/src-gen/magda/xtext/parser/antlr/internal/InternalMagda.g:801:1: Decision can match input such as "RULE_STRING_LITERAL" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input
warning(200): ../magda.xtext.Magda/src-gen/magda/xtext/parser/antlr/internal/InternalMagda.g:801:1: Decision can match input such as "'true '" using multiple alternatives: 1, 2
As a result, alternative(s) 2 were disabled for that input