in addition to the official Tag Guidelines
(based on the source code and field research)
Tags and Tag UI
Within the scope of Derpibooru,
Tag is a generalized text label that can be attached to (or removed from) an image, and describes a certain aspect of that image. Tags, attached to an image, are listed below the image on the view page. You can search for images that are, or are not tagged with a specific tag(s), and thus to find exactly (well, ideally) images you want to see, excluding images with content you prefer to leave unseen.
Tags, attached to an image (displayed under the image on its view page), or involved in a search query (displayed under the search bar), appear as colored “plates”. A tag plate contains the tag’s name in the middle, on the right is the number of images tagged with this tag, and on the left is one or several symbols: “+” for an unwatched tag, “-” for a watched tag, “S” for a spoilered tag, and “H” for a hidden tag.
When logged-in, and hovering mouse over a tag plate, a drop-down menu will appear that allows you watch, spoiler, or hide the tag respectively; the latter two — only if you use a custom filter, otherwise there will be a single line “Filter”, bringing you to the Filters page, where you can choose a standard filter, or create a custom one.
Images with tags you watch will appear in your Watched feed, those with spoilered tags will be covered with a “Tag Hidden” overlay unless explicitly searching for that tags (to see the image anyway, hover over its thumbnail, or click if on its view page), those with hidden tags will stop exist for you even if explicitly searching for that tags. You can centralizedly manage the tags you watch in your Settings (“Content Settings”), and spoilered/hidden tags — in your Filters.
Categories and Sorting
Derpibooru tags are divided into several categories, recognizable by their unique colors. When displayed under an image, tags belonging to the same category are grouped together, and sorted alphabetically within their group. In turn, the sorting order for the groups (categories) is defined in Derpibooru’s source code, as follows (the links lead to the tag search page with a query for a corresponding category):
I mean, I’m a pretty big fan of anthro, but can’t stand seeing human feet in anthro, so I always appreciate the possibility of filtering that
Indeed. Edited. Thanks. Posting half-asleep.
I’m not sure if you have them switched or if I misread your comment, but:
Ponies are unguligrade. Humans are plantigrade.
planti- and unguli- are important distinctions: some people may prefer kemonomimi-style representation (secondary features only, such as ears and tails) which covers plantigrade anthro, while others might prefer characteristics closer to the original character while still appearing more humanoid (behooved feet, hands optional, humanoid bearing/structure) which covers unguligrade anthro. There is a significant enough distinction. digiti- is a given under context for non-ponies (cats), but is a bit of a stretch considering their scarcity within this specific fandom outside of a handful of special characters and OCs.
“semi-anthro” is the one that always confused me, as it’s been used for everything from fighting over planti- usage to ponies standing upright to human genitalia on feral forms; even among furry communities, where bickering over anthroform definitions tends to produce epic wars, “semi-anthro” is hardly ever used as it’s so ill-defined.
Edited because: I need to not post half-asleep
Just ignore the whole ‘bodytype tag’ thing and the fact that a bunch of aliases aren’t in place yet. All in due time.