4.1 Feeds and Podcasts.Pptx

Module 4: Web 2.0

Carlos Delgado Kloos Dep. Ing. Telemática Universidad Carlos III de Madrid

Exercise

 Write down 10 keywords that come to your mind in relation with Web 2.0

 Together with your colleagues come up with those that are mentioned more often and better characterize Web 2.0

 Reduce these to just 2 keywords: a technical one and a non-technical one

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Web 2.0

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Read Read-only -write web web

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Web 2.0

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 Services, not packaged software, with cost-effective scalability  Control over unique, hard-to-recreate data sources that get richer as more people use them  Trusting users as co-developers  Harnessing collective intelligence  Leveraging the long tail through customer self- service  Software above the level of a single device  Lightweight user interfaces AND business models

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Harnessing Collective Intelligence

 James Surowiecki: The Wisdom of Crowds

 MIT Center for Collective Intelligence – cci.mit.edu – scripts.mit.edu/ ~cci/wiki/

 Cooperation Commons – www.cooperationcommons.com

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 From Web Pages – … to Feeds – … to Podcasts – … to Widgets – … to Mashups

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From Web Pages to Feeds

Carlos Delgado Kloos Dep. Ing. Telemática Universidad Carlos III de Madrid

 What is the key feature that characterizes feeds in relation to web pages?

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Communication Paradigms

 Through shared variables (shared memory)

Proc1 Mem Proc2 web

 Through message passing

Proc1 Proc2 email

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request

client server

response

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Push vs. Pull

 Pull – Web, http

 Push – PointCast • Company in California (1992-97) • News over a screensaver

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 Continuum – E-mail – E-mail with periodic retrieval – IM

 It’s all about how to launch requests.

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Content Syndication

 The distribution or redistribution of content to other Web sites

 Typical content forms include headlines, news, images, and multimedia clips (i.e., video and/or audio)

 Web sites that produce content place it on other sites for brand awareness or site traffic generation. Web sites that host syndicated content use it to attract visitors to their own sites.

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 RSS is a format for syndicating news and the content of news-like sites, e.g. – Major news sites like Wired, – news-oriented community sites like Slashdot, – and personal weblogs  Not only news: – the 'recent changes' page of a wiki, – a changelog of CVS checkins, – the revision history of a book  Feedreaders or aggregators are used to read feeds

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feed.html

Helps the browser identify feeds xml" href=”feed.xml" title="GIMI News"> Subscribe to the GIMI channel (by cdk): Reference to the feed

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Atom: – atomenabled.org – tools.ietf.org/html/rfc4287

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Atom

 Supported by IETF, Google and iTunes

 Inspite of that, RSS 2.0 is still preferred

 The term RSS is often used to include Atom as a possibility as well.

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GIMI news (by cdk) News for GIMI 2007-11-04T21:12:03Z Dates are important for the Class about XML available reader to learn about

The slides about XML are available

changes 2007-11-04T21:12:03Z Date syntax from RFC 3339, compatible with XML Schema

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How to Exchange Feeds?

 XML formats to exchange lists of web feeds between web feed aggregators  OPML – Outline Processor Markup Language – www.opml.org  XOXO – eXtensibleOpen XHTML Outlines – microformats.org/wiki/xoxo  OML – Outline Markup Language

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Carlos Delgado Kloos Dep. Ing. Telemática Universidad Carlos III de Madrid

Question

 What is the key feature that characterizes podcasts in relation to feeds ?

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 RSS enclosures are a way of attaching multimedia content to RSS feeds by providing the URL of a file such as – an MP3 file to a music recommendation or – a photo to a diary entry  The addition of enclosures to RSS was an important prerequisite for the emergence of podcasting  How it all started: – www.thetwowayweb.com/payloadsforrss

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Enclosures

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 Extends enclosures to handle other media types, such as short films or TV, as well as provide additional metadata with the media

 http://search.yahoo.com/mrss

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Media RSS

My MovieReviewSite http://www.dom.com I reviewmovies. MovieTitle: Isthisa goodmovie? http://www.dom.com/item1.htm http://www.creativecommons.org/licenses/by-nc/1.0 nonadult

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 http://www.vodcasts.tv/  http://www.vodstock.com

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Assignment

 Design a web site with – Login for users – Several gadgets: at least • a twitter box • a video • a calendar with events • event announcement with information (including a map) and registration • a feedback form

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www.igoogle.com/ig

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iGoogle Gadgets

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 Make your site social

 Allow logins from

 Example: www.mylatestpiece.com

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Google Friend Connect

 google.com/friendconnect

 Easy set-up without programming

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 Choose the apps you want from a gallery of gadgets created by Google and the OpenSocial developer community – You can get gadgets for photo sharing, concert listings and games, with many more to come

 Copy the snippets for the gadgets you've chosen

 Paste the snippets where you want them on your site and just like that, they'll be up and running

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