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Restrict design to not include a residue as an possibility in the task at a position unless it is the starting residue. If resnum is left as 0, the restriction will apply throughout the pose.
<DisallowIfNonnative name="(&string)" resnum="(0 &integer)" disallow_aas="(&string)" />
This task is useful when you are designing in a region that has Gly and Pro and you do not want to include them at other positions that aren't already Gly or Pro.
Note: "native" means the current residue, not the starting "-s" residue or "-in:file:native".