[1] Speech Recognition Grammar Specification Version 1.0 ( 版) <http://www.w3.org/TR/speech-grammar/>
[2] Speech Recognition Grammar Specification Version 1.0 () <https://www.w3.org/TR/2004/REC-speech-grammar-20040316/>
[4] SRGS Grammar XML Reference () <https://msdn.microsoft.com/ja-jp/library/hh361653>
[5] 音声認識文法の作成方法 — OpenHRI Manual () <http://openhri.readthedocs.io/en/latest/workingwithgrammar-ja.html>
[6] Semantic Interpretation for Speech Recognition (SISR) Version 1.0 () <https://www.w3.org/TR/semantic-interpretation/>