Bug 198221 Different master page when export report current page to different format.[05]
Description: Different master page when export report current page to different format. Build number:2.2.1.v200707270630 Steps to reproduce: 1. Preview attached report in Web Viewer. (the report uses multiple master page) 2. Jump to the third page. 3. Export report, select current page, select different formats. Expected result: All formats apply the same master page for the third page. Actual result: In pdf/ps, Master page content is page number in page header. In word/ppt, Master page content is current date in page footer. Error log:n/a
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/content/IContent.java
*/
	int getContentType();
	/**
	 * get the instance id of the content.
	 * the instance id is the unique id of the content.
	 * @return
	 */
	InstanceID getInstanceID();
	
	/**
	 * set the instace id of the content.
	 * the instance id can only be set by the content
	 * generator.
	 * @param id
	 */
	void setInstanceID(InstanceID id);
	
	static final int DOCUMENT_EXTENSION = 0;
	static final int LAYOUT_EXTENSION = 1;
	Object getExtension(int extension);
	
	/**
	 * Set the extension of the content.
	 * Only 2 extension supported so far
	 * 	<li>0: document extension</li>
	 * 	<li>1: layout extension</li>
	 * @param extension extension type
	 * @param value extension value
	 * @throws ArrayIndexOutOfBoundsException if index is outof range {0,1}
	 */