p:declare-step | p:import in p:declare-step

let's say that we have (p:declare-step[1] | p:import[2]) in
p:declare-step[3]

if [3] is an atomic step (non sub-pipeline declared), what do mean a [1] ?
in case [1] is a declaration of atomic step ? in case [1] is a declaration
of a pipeline ?

and what about having [2] in [3] when [3] is an atomic step ?

Regards,

Mohamed
-- 
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