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: Theory Women's Malty Skirt
Product feature: 100% Silk, 100% Silk lining, Dry clean, Package Dimensions: 10.8 x 6.1 x 1.4 inches, Shipping Weight: 7.2 ounces, ASIN: B01D9PKR3M, Item model number: F1102302, Date first listed on Amazon: March 1, 2016, Average Customer Review: Be the first to review this item
Product brand: Theory
Target attributes: Pattern
Answer: attribute: pattern
value: None
source: None