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<http://webisa.webdatacommons.org/149679352>	<http://www.w3.org/ns/prov#value>	"I am gonna explain a litle about my question, I have a shopping Card allready and does every thing except payment because I do not need to include payment, is a system for control books at my school. for each user, I want to get its Id and its prosucts selectd." .