By Dan Levine WASHINGTON (Reuters) – A U.S. appeals court on Wednesday closely questioned Googles claim that Oracle does not enjoy copyright protection over certain parts of the Java programming language. The issue, under review by the U.S. Court of Appeals for the Federal Circuit in Washington, is being closely watched by software developers in Silicon Valley. Googles Android operating system is the worlds best-selling smartphone platform. Oracle sued Google in 2010, claiming that Google had improperly incorporated parts of Oracles Java programming language into Android.