Bug 152834 support HTML description of the template
The template descrition is a fragment of HTML, use that fragment to render the template in HTML.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/content/IForeignContent.java
{
	
	public final String HTML_TYPE = "text/html";
	
	public final String TEXT_TYPE = "text/plaintext";
	
	public final String TEMPLATE_TYPE = "text/template";
	
	public final String EXTERNAL_TYPE = "object/external";