Proposal: Extend this repo's scope to include OPML

[saerdnaer]

I think we should also provide good example representations of podcast collections / item recommendation lists in OPML, not only in RSS or custom JSON.

What is OPML

OPML (Outline Processor Markup Language) comes from the same person as RSS 0.92 / 2.0 - Dave Winer.
As its long name suggest, OPML a XML dialect to describe outlines – but became more popular as as simple way to list RSS feeds, e.g. a blog roll or to transfer your subscriptions from one podcast app to another.
This is a separate section 'subscription lists' in the OPML spec:

• http://dev.opml.org/spec2.html#subscriptionLists

As already mentioned in another discussion there is also a JSON representation:

• http://scripting.com/2016/10/11/convertOpmlToJson.html
• http://scripting.com/code/opmltojson/?url=http://www.bbc.co.uk/podcasts.opml

I can also recommend to export your subscriptions via OPML, convert it to CSV via http://opml2csv.com and sort them in your favourite spreadsheet tool, as I did in Sep 2018, see below [1]. :-)

Broadcasters / Podcast networks already provide their list of podcasts als OPML e.g. http://podcasts.files.bbci.co.uk/podcasts.opml [via BBC radiolabs Blog]

Reasoning

As of today nearly every podcast app supports import and export of subscriptions, but all other information like how many episodes you listened are lost. We should extend OPML and document common practises like we do with RSS.

This is not thought as apposing proposal to the linked issues, but should be seen as an extension to the existing proposals to make it easier for users and app developers to implement ans use these ideas.

TBC…

Misc

Related: #240 #363

[1]

[daveajones]

I would also like to propose the namespace to be used in OPML for the basis of the channels tag work.