The Google Documents List API now looks redundant with the Google Drive API’s, with the Drive API being a super-set of the Documents List API, because it is intended to handle a great many more data-types. However, I don’t see anything in the Drive API that would obsolete the Data API, because gdata is intended to manipulate the contents of documents directly where they live in the cloud, without need for download or synchronization. It is a subtle difference, but important. GData may become more obscure, because more is going to be accomplished through all-out file synchronization, but still very important for specific types of applications that work on data where it lives in the cloud.
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