Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Viva Womens Summer Slip On Ballerina Love Heart Work Jelly Flat Ballet Shoes
Product description: These slip on flats feature jelly materials throughout, slip on design, low cut vamp, slightly pointed toe front, small wedge heel and oversized contrasting love heart detailing on the toe.
Product feature: Synthetic, Synthetic sole, Flat Love Heart Ballerina Shoes, Lightweight Jelly Materials Throughout, Slightly Pointed Toe Front, Low Cut Vamp, Oversized Contrasting Love Heart Detailing On The Toe, Package Dimensions: 10.3 x 7.6 x 4 inches, Shipping Weight: 1 pounds, ASIN: B01AGP8TB0, Date first listed on Amazon: January 11, 2016, Average Customer Review: 3.8 out of 5 stars 49 customer reviews
Product brand: Viva
Target attributes: Toe Style
Answer: attribute: toe style
value: pointed toe
source: product feature
attribute: toe style
value: pointed toe
source: product description