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#### 13.1.3 Selecting files

By default, all files with extension `.org` in the base directory are considered part of the project. This can be modified by setting the properties

`:base-extension` | Extension (without the dot!) of source files. This actually is a regular expression. Set this to the symbol `any` if you want to get all files in `:base-directory`, even without extension.
`:exclude` | Regular expression to match file names that should not be published, even though they have been selected on the basis of their extension.
`:include` | List of files to be included regardless of `:base-extension` and `:exclude`.
`:recursive` | Non-nil means, check base-directory recursively for files to publish.