XQuery how to keep order of elements?

I have a element "v" wich has different types of objects a,b,c.

and i do:
for $x in $doc/v/a where ... return $x
for $x in $doc/v/b where ... return $x
for $x in $doc/v/c where ... return $x
for each of them to filter them by conditions.
This way i get all the objects of type a, than all objects of type b,
than all obj of type c.

But I would like to have them in the original (mixed) order.
How to keep this order. Someone told me I could add a order by field.
But still I have to say "for each element whatever type, if it is of
type a than, else..". How do I say this in Xquery?

Paul

.

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