`prev` or `previous` relation in Links

[vincentsarago]

right now stac-fastapi-pgstac uses previous, while pgstac use prev
https://github.com/stac-utils/pgstac/blob/8a37c997f31439d203ee586fa8fdeb60d10b2f4b/src/pgstac/sql/004a_collectionsearch.sql#L121
https://github.com/stac-utils/pgstac/blob/8a37c997f31439d203ee586fa8fdeb60d10b2f4b/src/pgstac/sql/004_search.sql#L1029

stac-fastapi-pgstac/stac_fastapi/pgstac/models/links.py

Lines 152 to 173 in 4321497

	def link_prev(self) -> Optional[Dict[str, Any]]:
	"""Create link for previous page."""
	if self.prev is not None:
	method = self.request.method
	if method == "GET":
	href = merge_params(self.url, {"token": f"prev:{self.prev}"})
	return {
	"rel": Relations.previous.value,
	"type": MimeTypes.geojson.value,
	"method": method,
	"href": href,
	}
	if method == "POST":
	return {
	"rel": Relations.previous,
	"type": MimeTypes.geojson,
	"method": method,
	"href": f"{self.request.url}",
	"body": {**self.request.postbody, "token": f"prev:{self.prev}"},
	}
	return None

In the stac specs it's not specified which one to use but I feel we should at least use the same one as pgstac

from https://www.iana.org/assignments/link-relations/link-relations.xml

prev Indicates that the link's context is a part of a series, and that the previous in the series is the link target. [HTML]
previous Refers to the previous resource in an ordered series of resources. Synonym for "prev". [HTML 4.01 Specification]

[m-mohr]

The spec indeed allows both. That means that clients have to handle both, regardless of whether the server returns one of them or both.