question: public boolean isMatchingConcreteSyntax ( String valueString ) { if ( valueStrings . isEmpty ( ) || valueStrings . contains ( valueString ) ) { return true ; } int idx = valueString . lastIndexOf ( '.' ) ; if ( idx > 0 ) { if ( valueStrings . contains ( valueString . substring ( idx + 1 ) ) ) { return true ; } } return false ; }
target:  Shortcut to decide whether a given concrete syntax is potentially matching the contained objects.