Github user neykov commented on the issue:
https://github.com/apache/brooklyn-server/pull/748
Support for the [`type:
url`](https://github.com/apache/incubator-brooklyn/pull/71) was added around
the same time we added support for [yaml catalog
items](https://github.com/apache/incubator-brooklyn/pull/60). For a long time
it was the only way to compose yaml files out of other yaml files, using them
as building blocks. It works at the blueprint level, unaware of catalog items.
This only changed with the addition of the
[`include`](https://github.com/apache/brooklyn-server/pull/124) keyword.
Don't think it ever got a lot of use. +1 to deprecate and remove.
* `items: [ URL, ... ]` - +1, it's the currently recommended way to compose
catalogs
* `item: URL` - -1. What are your reasons to keep it @alx? I think we
should deprecate this one as well. Have just a single way of including other
items, through the catalog mechanism.
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