The total idea here is building a Display Page Template with a set of different fragments (and, possibly, web contents), but associated with a single object (perhaps, stored in external system and fetched by friendlyURL). For example,
page should display information about "The Louvre Museum".
Using Display Page Templates and The Info Framework we can fetch information from external system via REST (using friendlyURL part "the-louvre-museum.html"), then we can parse/process it and put into the display object, let's say "Museum", which fields are mapped to different fragments.
We may have different fragments for displaying different parts of the same objects: "Address" for displaying museum address information, "Opening Times" for opening times etc. (new ones may be added later).
When mapping fields it will be easier to select "sub-type" first, then the field (e.g. "Address -> ZIP Code").
Another (optional) feature request:
We may also have some Web Content in local LR database, associated with the same object (also using friendlyURL, e.g. "the-louvre-museum.html").
And we would like to map it's fields also (or just display it somewhere on page).
More details in Slack thread: https://liferay-community.slack.com/conversation/C5H30KZ1A/p1571319504204600