internationalization - How should I handle a template string in Xtext? -

i have following input:

 a: "a {foo foo}" 

where foo of type foo; business layer provide value variable. after processing input, 2 files generated: properties file , java class:

 a=a {0}   public static i18nmessage a( foo foo ) {      return new i18nmessagebuilder().id( "a" ).args( foo ).build();  } 

the idea assign each message id gives me java class contains methods (where name == id) , accepts typed parameters complete messages.

my question: how should handle text strings in xtext grammar? have code completion parameter types (foo) have no idea how handle rest of string can contain spaces , valid unicode character.

suggestions?

i found better solution gives pretty simple grammar , solves other problems:

a(foo foo): "a " foo; 

so text message list of strings , parameters. way, code completion simple , there no need escape sequences if want add formatters:

a(date d): "date " d( "short" );