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Service feeds

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Mo McRoberts edited this page Aug 16, 2010 · 1 revision

Service feeds are Atom Syndication Format feeds which deliver content to connected devices, be they hybrid receivers, second screens, or something else. The aim of this part of the specifications is to describe how:

  • Resources linked to from the feeds can be termed related to over-the-air broadcasts
  • Resources linked to from the feeds can be termed an alternative means of obtaining over-the-air broadcasts
  • Feeds can be used to deliver linear programming
  • Availability information can be specified — that is, “not available until” and “will not be available after” metadata
  • Different versions of the same content (for example, targeting different devices) can be carried in the same feed
  • Feeds can be used to associate interactive content (for example, web applications) with broadcasts and other content

Feeds may be subscribed to individually, or by way of a Service manifests, which itself may be located either Manual service subscription or TVDNS

The principal association mechanism is the Atom link element, making use of the rel attribute to describe different kinds of relationship.

Where possible, crid:// URIs should be used — both for identifying over-the-air programmes and for content delivered solely via IP.

Each distinct piece of content is described by way of an Atom <entry>.

TODO: Are there standard (or semi-standard) attributes to denote embargo/expiry on an Atom <entry> or <item>?

AtomPub Link Extensions are used to provide media query support.

TODO: Augment with PO, TVA and MediaRSS metadata? One of, all of?

Sample, describing a piece of broadcast content and a means to obtain it on-demand using a web page:

<entry>
<title>Holby City - Series 11 - Out of the Woods</title>
<id>tag:bbc.co.uk,2008,pips:b00mqjvv</id>
<updated>2009-09-18T04:00:00Z</updated>
<link rel="alternate" href="crid://bbc.co.uk/272927518" />
<link rel="alternate demand" href="http://www.bbc.co.uk/iplayer/b00mqjvv" type="text/html" le:media="screen" />
<link rel="alternate demand" href="http://stream.bbc.co.uk/3gp/b00mqjvv/b00mqjv0.3gp" type="video/3gpp" le:media="mobile" />
<summary>Hospital Drama. Joseph is still tormented over Faye and Linden's relationship.</summary>
</entry>
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