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# Add a Field to a Document

The following script demonstrates how to add a field named “MyField” to a document, with a value of “MyValue”.

    function handler(config, document, params)
    	document:addField("MyField", "MyValue");
    	return true;
    end

The following script demonstrates how to add the field `AUTN_NEEDS_MEDIA_SERVER_ANALYSIS` to all JPEG, TIFF and BMP documents. This field indicates to CFS that the file should be sent to a Media Server for analysis (you must also define the `MediaServerAnalysis` task in the CFS configuration file).

The script finds the file type using the `DREREFERENCE` document field, so this field must contain the file extension for the script to work correctly.

    function handler(config, document, params)
    	local extensions_for_ocr = { jpg = 1 , tif = 1, bmp = 1 };
    	local filename = document:getFieldValue("DREREFERENCE");
    	local extension, extension_found = filename:gsub("^.*%.(%w+)$", "%1", 1);

    	if extension_found > 0 then
    		if extensions_for_ocr[extension:lower()] ~= nil then
    		   document:addField("AUTN_NEEDS_MEDIA_SERVER_ANALYSIS", "");
    		end
    	end

    	return true;
    end

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