Custom plugin repository xml manifest file format

Hi, I have a question about the manifest file of the custom plugin repository. It seems that both the formats of

1. https://www.jetbrains.com/help/idea/managing-plugins.html#repos and

2. https://plugins.jetbrains.com/plugins/list?build=2018.3&channel=EAP

are accepted by the IDE. I am building an enterprise repository and not sure which one to use.

My need for this repository is that once configured the correct repository url, all the versions of the plugins in the repo will be returned in the manifest file and I want the IDE to pick up the latest compatible version through the `since-build` and `until-build` fields. I've tested the option 1, but the IDE still shows all the versions whether compatible or not though the IDE shows an red error message if the version is not compatible.

I've tested the option 2 as well, but it still shows multiple versions although the option 2 link doesn't. I'm not sure how the IDE decide whether to show one version or all the versions. Can anyone help? Thank you.