As is usually done with SVN, it doesn’t “block” people the way you ask: on the contrary, SVN allows several developers to work on the same file, and the modifications of each of them are then combined. "
This merger is mostly automatic; but when it is "too complicated" (for example, when two developers modified the same part of a file), one person should resolve the "conflicts" by indicating which modifications of which the developer should be supported.
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