The URL of a picture that is associated with VariationSpecificValue. The first PictureURL is also used as the gallery picture for applicable variations. For example, if the picture set contains pictures of red shirts (i.e., VariationSpecificName=Color and VariationSpecificValue=Red), the first picture is used as the gallery picture for all the red shirt variations.
See the Field Index to learn which calls use PictureURL.
A value that is associated with VariationSpecificName. For example, suppose this set of pictures is showing blue shirts, and some of the variations include Color=Blue in their variation specifics. If VariationSpecificName is "Color", then VariationSpecificValue would be "Blue".
See the Field Index to learn which calls use VariationSpecificValue.