[multi-sources-removal] Drop pyrorql and zmqrql sources After a few years experementing "true" multi-sources, we're now moving to "copy-based" source à la datafeed. As pyro and zmq sources have no more known customers and the related code is in the way of future refactoring of cubicweb's core, we decided to drop support for those sources without backward compatibility. If you're still using a zmqrql or pyrorql source and you want to upgrade, ask support to move it to datafeed using a pre-3.19 version first. Related to #2919300 (first step)

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Schema of the data

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First take a look at the data schema_ then try to remember that you are browsing

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through a heap of data by applying stylesheets to the results of queries. This

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site is not a content management system with items placed in folders. It is an

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interface to a database which applies a view to retreived data.

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.. _schema: schema