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_AS_ATTACHMENT = "__asattachment"; 
	/**
	 * URL parameter name to indicate the execution name.
	 */
	public static final String PARAM_ACTION = "__action"; 
	/**
	 * URL parameter name to indicate the client DPI setting.
	 */
	public static final String PARAM_DPI = "__dpi"; 
	/**
	 * URL parameter name to indicate whether clean session files.
	 */
	public static final String PARAM_CLEAN_SESSION = "__clean"; 
	/**
	 * URL parameter name to indicate if force optimized HTML output.
	 */
	public static final String PARAM_AGENTSTYLE_ENGINE = "__agentstyle"; 
	/**
	 * 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.
	 */