returns the result of interpreting the object as an instance of ` library ' . this implementation returns null ; returning a non-null result will terminate the switch . concode_field_sep bz242995Package modelPackage concode_field_sep T caseBook concode_elem_sep T caseOneTimeWonder concode_elem_sep T doSwitch concode_elem_sep T doSwitch concode_elem_sep T doSwitch concode_elem_sep T caseAuthor concode_elem_sep T caseWriter concode_elem_sep T defaultCase
T function ( Library arg0 ) { return null ; }