Bug 119220 Image in library can't display properly when it is imported in a report design.
Description: Image in library can't display properly when it is imported in a report design. Steps to reproduce: 1. Add an image in a library. 2. Use this library in a report design. 3. Drag the image from library explorer into layout view. 4. The image is marked invalid.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ImageHandle.java
/**
	 * Returns the type expression of the image item if the image source type is
	 * <code>IMAGE_REF_TYPE_EXPR</code>.
	 * 
	 * @return the type expression, if the image source type is
	 *         <code>IMAGE_REF_TYPE_EXPR</code>. Otherwise, return
	 *         <code>null</code>.
	 * 
	 */
	public String getTypeExpression( )
	{
		if ( DesignChoiceConstants.IMAGE_REF_TYPE_EXPR
				.equalsIgnoreCase( getSource( ) ) )
		{
			return getStringProperty( ImageItem.TYPE_EXPR_PROP );
		}
		return null;
	}
	/**
	 * Returns the value expression of the image if the image source type is
	 * <code>IMAGE_REF_TYPE_EXPR</code>.
	 * 
	 * @return the value expression, if the image source type is
	 *         <code>IMAGE_REF_TYPE_EXPR</code>. Otherwise, return
	 *         <code>null</code>.
	 */
	public String getValueExpression( )
	{
		if ( DesignChoiceConstants.IMAGE_REF_TYPE_EXPR
				.equalsIgnoreCase( getSource( ) ) )