Utilize the input text as a context reference, choose the right relationship between Xstrata and Glencore from the options. Options: 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