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Add a bit more guidance about sequence #8871

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7 changes: 6 additions & 1 deletion docs/reference/stdlib/sequence.rst
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Expand Up @@ -32,11 +32,16 @@ Sequences
scalar type TicketNo extending sequence;

type Ticket {
number: TicketNo {
required number: TicketNo {
constraint exclusive;
}
}

A property set to a sequence type has an implicit default of calling
``sequence_next``. If you are using this as an auto-incrementing exclusive
property, you probably want it to be ``required`` and ensure that you're not
setting the property explicitly when inserting objects.

A sequence is bound to the scalar type, not to the property, so
if multiple properties use the same sequence, they will
share the same counter. For each distinct counter, a separate
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