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Collections added: Collections are a type of Catalog with additional fields, such as provider and license. Items must belong to a single Collection.
Extension maturity: Protocol for providing maturity classification for extensions based on stability and implementations.
Commons extension: The previous 'Collections' extension is now the 'Commons' extension and allows an Item to inherit properties from its Collection.
Datetime-range extension: Extension for providing start and end datetimes.
Scientific extension: Extension for providings links to scientific publications relating to the data.
rel types: A list of supported rel types are provided for use when specifying links, derived_from and license types added.
eo:constellation: A new field in the EO specification to specify a grouping of platforms.
stac_version: The stac_version field is required on all Catalogs (and Collections).
JSON schemas: Added JSON schemas where they were missing.
Single Item extension: Extension to supply License and Providers for single Items when no collection is used.
UML Diagram: See STAC-060-uml.pdf.
Development Process: See process.md for information on the STAC development process.
Changed
API: Main catalog endpoint at /stac, search endpoint now at /stac/search.
eo:bands: The eo:bands field is now an array rather than a dictionary, and has been moved inside of properties in a STAC Item.
Catalog fields: Catalogs have a smaller number of basic fields: id, stac_version, title (optional), description, and links. The new Collections type contains additional fields.
links: The links fields are now an array rather than a dictionary.
properties: Fields with the data type array or objects are allowed inside the properties in a STAC Item.
description: Description fields now allow formatting with CommonMark.
assets: Fields changed names: name to title and mime_type to type.
Removed:
provider: Provider field in Items got removed. Use Collections or the Single Item extension instead.
license: License field in Items got removed. Use Collections or the Single Item extension instead.