Indpendant position marks for scripts ?

Hi,

I want to process a text with script.
The text contains of two regions:
The first region contains of lines beginning with keyword_a
and the second one start with keyword_b.
I want to sort the first region using sort with pattern_a and
after that I want to sort the second region with pattern_b.

I can set the start of the forst sort with

: /keyword_a

in the script. But I dont know how to limit the range of the first
sort so that only lines starting with keyword_a are sorted using
pattern_a. Same goes for the second region...

Best regards and thank you very much for any help in advance!
Have a nice weekend!
mcc

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