Browse the implementors of #beVariable message and you will find other filters under BPatternVariableNode class, such as #beInstVar or #beLocalVar. If you miss something, just add a method. No new syntax required.
TDT (Token-and-Duration Transducer):
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Credit: Liam Daniel / Netflix。关于这个话题，服务器推荐提供了深入分析
（四）一年以内曾受过治安管理处罚的。