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Simple schema question

In specifing a schema is there a way to say an object MUST have
x or Y?

I know x and Y is:

MUST (x $ Y)

but is there an "OR" type construct that works on a set of

Example: must (a,b,c and either d or e) may (f)

(MUST (a $ b $ c $ (d || e))
 MAY (f))