Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: HP Pavilion ze4315us Laptop (1.53-GHz Athlon XP-M 1800+, 256 MB RAM, 30 GB Hard Drive, DVD/CD-RW Drive)
Product feature: HP Pavilion ze4315us Laptop, 1.53-GHz Athlon XP-M 1800+, 256 MB RAM, 30 GB Hard Drive, DVD/CD-RW Drive
Product brand: HP
Target attributes: Weight
Answer: attribute: weight
value: None
source: None