The bulk update request #3583 is active.

change category part_of_a_set (0) -> invalid

Reason: We already have this tag, it's called inpool:true or isparent:true.

Update: Tag cleaned. Parents or pools added to 9 posts as appropriate. The other 12 already had parents or pools. While I was researching the origins of some of those posts I discovered that this apparently is a standard tag on Derpibooru, which probably explains where it's been coming from.

EDIT: The bulk update request #3583 (forum #350353) has been approved by @slyroon.

wat8548 said:
The bulk update request #3583 is active.

change category part_of_a_set (0) -> invalid

Reason: We already have this tag, it's called inpool:true or isparent:true.

Update: Tag cleaned. Parents or pools added to 9 posts as appropriate. The other 12 already had parents or pools. While I was researching the origins of some of those posts I discovered that this apparently is a standard tag on Derpibooru, which probably explains where it's been coming from.

Just so you know... a pool is not a set. And I don't see inset:true anywhere in the cheat sheet.

Though this might still not be a valid tag. I'm not sure.

kyiiel said:
Just so you know... a pool is not a set. And I don't see inset:true anywhere in the cheat sheet.

Though this might still not be a valid tag. I'm not sure.

I'll admit I overlooked this when I voted but I still agree with it being invalid. I'm pretty sure the tag itself is referring to set meaning a set of connected posts, which is handled by inpool:true or isparent:true

If it's instead interpreted as part of a post set it wouldn't be relevant at all, post sets are pretty much just people's personal collections and the other posts in the set are likely to be completely unrelated to the post, so there's no point including this in the tags.

Additionally it would just be a logistical nightmare to handle, I could make all of my post sets public and then part_of_a_set would be required to be added to tens of thousands of posts, then I can make it private again and all those usages would have to be removed again.

If people to be able to search whether a post is in a set for some reason a feature request should be made for inset:true / inset:false because a regular tag would be unmanageable.

kyiiel said:
Just so you know... a pool is not a set. And I don't see inset:true anywhere in the cheat sheet.

Though this might still not be a valid tag. I'm not sure.

You are making the unwarranted assumption that people who demonstrably don't know about pools or parents are nevertheless familiar with an even more obscure feature of this site. None of the posts were using the word "set" in its e621 definition.

I feel like that would completely brake the search parameters to have inset:true available, either A it will show you private sets or B, it would lag down the system trying to produce results to images that are in hundreds or thousands of different sets

The bulk update request #3583 (forum #350353) has been approved by @slyroon.