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2.2.20 search:dotfileextension element

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The file name extension of the file that is represented by the RSS item. 

 /rss/channel/item/search:dotfileextension

The RSS 2.0 format extensions extend the item element, as specified in [RSS2.0], such that it SHOULD contain a search:dotfileextension element. This element MUST be of type String and MUST NOT occur more than once. This element MUST begin with a period (.) and MAY contain more than 7 characters, for example, <search:dotfileextension>.docx</search:dotfileextension>.