Bug 149922 Image builder - URI and file source type are treated as same
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/parser/ImageState.java
setProperty( ImageItem.SOURCE_PROP,
					DesignChoiceConstants.IMAGE_REF_TYPE_EXPR );
			type++;
		}
		if ( type > 1 )
			handler
					.getErrorHandler( ).semanticError( new DesignParserException(
							DesignParserException.DESIGN_EXCEPTION_IMAGE_REF_CONFLICT ) );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.util.AbstractParseState#end()
	 */
	public void end( ) throws SAXException
	{
		Module module = handler.getModule( );
		checkImageType( );
		String refType = image
				.getStringProperty( module, ImageItem.SOURCE_PROP );
		if ( DesignChoiceConstants.IMAGE_REF_TYPE_EXPR
				.equalsIgnoreCase( refType ) )
		{
			String valueExpr = image.getStringProperty( module,
					ImageItem.VALUE_EXPR_PROP );
			if ( StringUtil.isEmpty( valueExpr ) )
			{
				handler
						.getErrorHandler( ).semanticError( new DesignParserException(
								DesignParserException.DESIGN_EXCEPTION_INVALID_IMAGEREF_EXPR_VALUE ) );