Disable maintaining PartID of node type

I want PartID of GoMultiTextNode always be -1 and PartID of others still be maintained.
Tell me how to do.
Thank for ahead

That’s an unusual request. Could you explain why you want to do that?
I suppose you could override the PartID property to always return -1 and to be a no-op in the setter:
public override int PartID {
get { return -1; }
set {}
But I have no idea of whether that will cause any undesirable side-effects. GoDocument would still try to set the PartID when such a node is added – it just wouldn’t have any effect with that override.