Bug 193875 we can not get an entir url by IHTMLActionHandler
we can not get an entir url by IHTMLActionHandler, so word emitter dose not write the right url. now hyperlink drill through in word emitter doesn't work.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
*/
	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__"; 
	/**
	 * URL parameter name to indicate the resource folder of all the report
	 * resources.
	 */
	public static final String PARAM_RESOURCE_FOLDER = "__resourceFolder"; 
	/**
	 * URL parameter name to indicate the target servlet pattern.
	 */
	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"; 
	/**
	 * URL parameter name to indicate if open document as attachment(default is
	 * inline ).