Luiz Fernando Gomes Soares Rogério Ferreira Rodrigues Renato Cerqueira Simone Diniz Junqueira Barbosa Variable handling in time-based XML declarative languages. 1821-1828 2009 SAC http://doi.acm.org/10.1145/1529282.1529689 conf/sac/2009 db/conf/sac/sac2009.html#SoaresRCB09