XSPFXML Shareable Playlist Format
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If the recording was acceptable, the audio was hosted and distributed using tools such as Amazon Simple Storage Service (S3), iTunes, and XSPF. The audio files were first exported in both MP3 and WAV formats and then were hosted using Amazon S3.
Around this time, XSPF (xiph.org; a playlist-oriented media player) was seen as an alternative, and the XSPF player was ultimately adopted for serving all the files from the CFL blog (foundationlibraries.blogspot.com).