[Gimp-developer] Parasites and Tattoos: some questions

[saulgoode at brickfilms.com]

Parasites:

Is there a philosophical reason that parasite changes are not  
UNDOable? If not, could someone provide a nudge on how "non-tile"  
information is saved to the UNDO history (for example, layer name  
changes)?

Also, the "*-parasite-find" PDB functions return a list containing a  
single list: for example,

(("gimp-comment" 1 #18"4372656174656420776974682047494d5000"))

There does not appear to be a way to create multiple parasites with  
the same name -- the "*-parasite-attach" function changes the value of  
the existing parasite. Is there a reason for the parasite to be  
enclosed doubly within a list?

Tattoos:

If an object has a specific tattoo assigned to it then, when the  
object is destroyed, is the tattoo value made available for re-use?  
For example, I have three layers and record their tattoos. I then  
merge those layers which generates a new layer (with a new tattoo).  
Can I rely on the tattoos of the original layers not being assigned to  
a new object (during that image editing session)? (If so, I would like  
to assign the original tattoo to the merged layer.)

Or, is there a way to test a value to see if it is already attached to  
an object?