OPML Outline Processor Markup Language File Format
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OPML file format is based on XML standard and is used for Web-related purposes. OPML standard was developed by Radio Userland group; three version of the standard were released (1.0, 1.1, and 2.0). OPML files are commonly used for web feeds such as RSS.

OPML document contains following sections: version, head, body, and outline. OPML is a multiplatform standard, and can be used to exchange information between various applications.

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