Bug 214204 Only document content in document folder should be removed.[0601]
Description: Only document related content in document folder should be removed. Build number:2.3.0.v20080103 Steps to reproduce: 1. Deploy BIRT. 2. Edit web.xml to set BIRT_VIEWER_DOCUMENT_FOLDER to your local path and there are content inside the path. 3. Start server and click View Example to preview sample report. Expected result: Only content created by viewer should be removed in specified document folder. Actual result: All contents are deleted despite whether they are related with BIRT. Error log:n/a
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
/**
	 * URL parameter name to indicate the export encoding.
	 */
	public static final String PARAM_EXPORT_ENCODING = "__exportEncoding";
	/**
	 * URL parameter name to indicate the CSV separator.
	 */
	public static final String PARAM_SEP = "__sep";
	/**
	 * URL parameter name to indicate whether exports column's data type.
	 */
	public static final String PARAM_EXPORT_DATATYPE = "__exportdatatype";
	/**
	 * URL parameter name to indicate if fit to page when render report as PDF.
	 */
	public static final String PARAM_FIT_TO_PAGE = "__fittopage";
	/**
	 * URL parameter name to indicate if pagebreak pagination only when render
	 * report as PDF.
	 */
	public static final String PARAM_PAGEBREAK_ONLY = "__pagebreakonly";
	/**
	 * Indentify the display text of select parameter
	 */
	public static final String PREFIX_DISPLAY_TEXT = "__isdisplay__"; 
	/**
	 * Indentify the parameter value is a locale string
	 */
	public static final String PREFIX_ISLOCALE = "__islocale__"; 
	/**