Add Imgurl To The Product Structured Data

I'm editing

/design/themes/ themename /templates/addons/seo/hooks/products/view_main_info.pre.tpl to make some changes to the structured data shown. I would like to include the image field, but i can't seem to figure out how to load this variable.

I tried:

but that doesn't work. Also is there a list somewhere of the possible attributes?

Try to use:

{$image_data=$product.main_pair|fn_image_to_display:$settings.Thumbnails.product_details_thumbnail_width:$settings.Thumbnails.product_details_thumbnail_height}
 

Perfect, thanks!

Also is there a list somewhere of the possible attributes?

http://schema.org/IndividualProduct

This seems interesting, how can it be used?