'''isBAModeExpression/10'''

 * 'NIL'|package_name
 * component_type_identifier
 * 'NIL'|component_implementation_identifier
 * annex_identifier
 * transition_identifier
 * expression_identifier
 * '(' | operand1
 * 'AND'|'OR'|'XOR'|'AND THEN'|'OR ELSE'
 * ')' | operand2
 * line number (integer)

notes:

 * New in BA 2.0