Is Apache Shindig 100% compatible with iGoogle implementation of gadgets.* API and gadget XML specs.
iGoogle (and Orkut, and Wave, etc) all use Apache Shindig to power their gadget sites.
There are a number of iGoogle specific extensions that are not part of Shindig so it is not 100% compatible. Also the default Shindig container implementation does not support UserPrefs very well.
However this will get better soon. Google is contributing what they call the 'common-container' to Shindig, which will make it more compatible and capable.
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