Bug 150347 Support binary stream as preview image.
See 144843. We need model to save binary strame as report preview image. Currently, preview image is an external image. Maybe need a type to distinguish preview image type.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/parser/ListPropertyState.java
* @see org.eclipse.birt.report.model.util.AbstractParseState#startElement(java.lang.String)
	 */
	public AbstractParseState startElement( String tagName )
	{
		if ( tagName.equalsIgnoreCase( DesignSchemaConstants.STRUCTURE_TAG ) )
			return new StructureState( handler, element, propDefn, list );
		if ( tagName.equalsIgnoreCase( DesignSchemaConstants.EX_PROPERTY_TAG ) )
			return new ExtendedPropertyState( handler, element, propDefn, list );
		return super.startElement( tagName );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.util.AbstractParseState#end()
	 */
	public void end( ) throws SAXException
	{
		if ( struct != null )
		{
			
			PropertyDefn memberDefn = (PropertyDefn) struct.getDefn( )
					.getMember( name );
			struct.setProperty( memberDefn, list );
		}
		else
			element.setProperty( name, list );
	}
	/*
	 * (non-Javadoc)
	 *