source: [lemma=but] [tag=JJ] [□] □ □
destination: [lemma=but] [tag=JJ] [□=□] □ □
spec: The SBML is valid , but no longer represents the intention of the authors . " It 's not about trying to pin down the meaning of Britishness , but encouraging children to ask questions about what it means to live in Britain in the 21st century .