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Storage of widgets, widgets libraries and projects are implemented into the databases accessible in the OpenSCADA system. The DB is structured on the data belonging to the library-project. Ie a separate library-project stores in a separate group of tables of one or of the different databases. The list of libraries of widgets is stored in the index table of the libraries with the name "VCALibs", with the structure "Libs", and the list of projects in the index table "VCAPrjs", with the structure "Projs". A copy of this table is created in each database, which stores data of the module with the list of libraries which are hold in a given database. To the list of the tables belonging to the library of widgets and projects, are included:

Projections (structures) of basic tables are as follows:

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