Bug 136279 Structure and table datatypes should be hidden.
Description: Structure and table datatype should be hidden. Steps to reproduce: In table data binding, I saw structure and table two datatypes. They are not supported now, so they should be removed.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ReportDesignHandle.java
for ( Iterator iter = tempList.iterator( ); iter.hasNext( ); )
		{
			rtnList.add( ( (DesignElement) iter.next( ) ).getHandle( module ) );
		}
		return Collections.unmodifiableList( rtnList );
	}
	/**
	 * Auxilary method, help to find design element which holds and template
	 * definition.
	 * 
	 * @param contents
	 *            the contents to search.
	 * @param addTo
	 *            The list to add to.
	 */
	private void findTemplateItemIn( Iterator contents, List addTo )
	{
		for ( ; contents.hasNext( ); )
		{
			DesignElement e = (DesignElement) contents.next( );
			if ( e.isTemplateParameterValue( module ) )
			{
				addTo.add( e );
				continue;
			}
			LevelContentIterator children = new LevelContentIterator( e, 1 );
			findTemplateItemIn( children, addTo );
		}
	}
}