This is not something new, T. Berners-Lee has been talking about it since 2006, but I wanted to put some description of his 5-star system for Open Linked Data. You can read his entire idea from his post.
In it, Berners-Lee introduced the idea of providing stars for the data people publish and below you can see the types of levels1:
|Web data without an open license|
|make your stuff available on the web (whatever format) under an open license|
|make it available as structured data (e.g. excel instead of image scan of a table)|
|non-proprietary format (e.g. csv instead of excel)|
|use URLs to identify things, so that people can point at your stuff and serve RDF from it|
|link your data to other people’s data to provide context|
He talked about his star system in 2010 in a gov2.0 expo in Washington, DC and you can watch the video from the talk:
He talked about his star system in 2010 in a gov2.0 expo in Washington, DC and you can watch the video from the talk
All those efforts are important mostly to create context around various types of data being publishing continuously and the effort to create/establish relationships among them for the ability to discover related information which can be used in unexpected ways, adding value to it.