Bug 173582 Run servlet should not be affected by values in document.[0000]
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
*/
	public static final String PARAM_SERVLET_PATTERN = "__pattern"; 
	/**
	 * URL parameter name to indicate the target window.
	 */
	public static final String PARAM_TARGET = "__target"; 
	/**
	 * URL parameter name to indicate whether cache the parameter.
	 */
	public static final String PARAM_NOCACHE_PARAMETER = "__nocache"; 
	/**
	 * Custom request headers to identify the request is a normal HTTP request
	 * or a soap request by AJAX.
	 */
	public static final String HEADER_REQUEST_TYPE = "request-type"; 
	/**
	 * The request type of "soap".
	 */
	public static final String HEADER_REQUEST_TYPE_SOAP = "soap"; 
	/**
	 * Parameter name that gives the IID of the export data form.
	 */
	public static final String PARAM_IID = "iid"; 
	/**
	 * Parameter name that gives the result set names of the export data form.
	 */
	public static final String PARAM_RESULTSETNAME = "ResultSetName"; 
	/**
	 * Parameter name that gives the selected column numbers of the export data
	 * form.