Keywords in common metadata

[emmanuelmathot]

Related Issue(s): #1187

Proposed Changes:

1. Keywords fields in common metadata to have it available in Stac Item

PR Checklist:

• This PR is made against the dev branch (all proposed changes except releases should be against dev, not master).
• This PR has no breaking changes.
• I have added my changes to the CHANGELOG
  or a CHANGELOG entry is not required.
• This PR affects the STAC API spec,
  and I have opened issue/PR #XXX to track the change.

[emmanuelmathot]

Not sure it affect STAC API spec

[m-mohr]

Thanks. The collection should still have keywords, just referenced from the common metadata. So no change in Collections except that the schema lives somewhere else.

No effect on STAC API, I think.

[emmanuelmathot]

isn't it included automatically with the common metadata inclusion?

stac-spec/collection-spec/json-schema/collection.json

Line 11 in 92161e4

"$ref": "../../item-spec/json-schema/common.json#"

[m-mohr]

Good point, I'll check...

[m-mohr]

Validation works flawlessly in Items, Catalogs and Collections.

I made some minor textual changes for clarification. Looks good to be merged :-)

[m-mohr]

@cholmes @matthewhanson Would someone be willing to review this?