Generate a correct and concise answer for the question based on the words in the context.

Context : Hermann-Friedrich Joppien (19 July 1912 -- 25 August 1941) was a German Luftwaffe military aviator during World War II, a fighter ace credited with 70 enemy aircraft shot down in roughly 270 combat missions.
Question : During which historic war was Hermann-Friedrich Joppien an officer?
World War II

Context : Kim Gandy graduated from Louisiana Tech University in Ruston, the seat of Lincoln Parish, where she earned a Bachelor of Science degree in mathematics.
Question : The college Kim Gandy attended was what?
Louisiana Tech University

Context : 3DML files are written in an XML syntax which can be delivered from standard web servers and shown within a browser plugin and independent 3DML browser called Flatland Rover.
Question : The 3DML is based upon what?
XML