exec order

I have a default file in one of my subtrees that gets 4 datasources  
via the exec option.
These are 4 different perl script that are being called.

That part of the file looks something like:

dataSource source1
  ds-source = "exec:0:script1"

dataSource source2
  ds-source = "exec:0:script2"

dataSource source3
  ds-source = "exec:0:script3"

dataSource source4
  ds-source = "exec:0:script4"

My question is this: Is there any way to make sure that script1 is  
always run first?

Right now the order seems pretty random.

Thank you,

Alban


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