What is the relationship between Xstrata and Glencore in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

"We now find Glencore is the first of the major miners to raise equity in the current tough pricing environment, the marketing division failing to deliver as indicated in [the first half of 2015], poor acquisition outcomes in [African oil group] Caracal and Xstrata and difficult operating outcomes in key assets," Clifford says.

Answer: owned_by