1.0.0-beta.5 children

In the upcoming (1.0.0-beta.5) release of stac-spec, a few new conformance classes will be added. Among them is an extension which will add a /children endpoint. Quoting the tentative stac-spec document,
"A STAC API Landing Page (a Catalog) can return information about the Catalog and Collection child objects it contains using the link relation children to an endpoint /children. The purpose of this endpoint is to present a single resource from which clients can retrieve all the immediate child objects of a Catalog, which may be Catalog or Collection objects. The child link relations in a Catalog already allow for describing these relationships, but require a client to retrieve each resource URL to find any information about the children (e.g., title, description), which can cause significant performance issues in user-facing applications."
More, here: https://github.com/radiantearth/stac-api-spec/blob/5a694d5daf838e5edb974a2e7fdfa59547435340/children/README.md