  We present a survey of X-ray emission from young stars in the Sword of Orion
star-formation region using XMM-Newton's EPIC detectors. We find over 850 X-ray
sources, of which more than 700 have near-infrared counterparts consistent with
being young stars. The survey enables statistical investigation of the
dependence of X-ray emission properties of young stars on fundamental stellar
parameters (mass, rotation, age) and environmental features (circumstellar
disk, active accretion, circumstellar absorption), and study of structure size
in individual coronae through analysis of large flares.
