[security] test and fix/refactor optimization of optional varialbe when rewriting rql
.. -*- coding: utf-8 -*-
Le langage RQL (Relation Query Language)
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Voir la `documentation de RQL <file:///home/sandrine/src/fcubicweb/rql/doc/build/html/index.html>`_ .
[TODO]
Specific link to RQL complete documentation to remove duplicated content.