Have you looked over the seminar videos on youtube? I know Mathias' Advanced tips and tricks video talks about building a tag expression (in the context of defining a selector), and bootstrap conditions are the same sort of thing.
Conditions are defined as part of the bootstrap (the third blue button to the right of a bootstrap is "conditions"). If you're looking for an example, check out the Elemental Movement class special of the Arcanist class.
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