The issues in this case, which is governed by Chapter 95 of the Civil Practice & Remedies Code, are: (1) whether a fact issue exists about whether a landowner retained "some control" over an independent contractor's employee's work; (2) whether the common-law open-and-obvious defense applies to Chapter 95 and eliminates the landowner's duty to warn the independent contractor's employee of a danger, and if so, whether the independent contractor's employee raised a fact issue on the necessary-use exception to this defense; and (3) if the independent contractor's employee's knowledge of the dangerous condition did not obviate the landowner's obligation to issue an adequate warning, whether a fact issue exists about whether the landowner issued an adequate warning.