Github user ahgittin commented on the issue:
https://github.com/apache/brooklyn-server/pull/748
+1 to deprecating `type: URL` as it implies a deploy-time URL lookup which
can change (at least on rebind, if we switch to persisting BOMs instead of
`CatalogItem`s maybe sooner)
reason for `item: URL` is it's the only way to use an item YAML file in the
catalog. e.g. you've built a YAML which deploys just fine. you might want to
save that as a file for easy editing and ad hoc re-deploy. but you also want
to put it in a catalog. this lets you define the metadata in the catalog yaml
and then reference the item yaml.
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