Schematron using XPath 2.0 The attribute @unit must be equal to one of the following values 'J', 'MeV', 'eV', 'keV'. The attribute @unit must be equal to one of the following values 'J', 'MeV', 'eV', 'keV'. The attribute particle:Particle_Parameter/particle:ion_type must be equal to one of the following values 'Alpha', 'Heavy', 'Proton'. The attribute particle:Particle_Parameter/particle:particle_measurement_type must be equal to one of the following values 'Composition', 'Count Rate', 'Counts', 'Current', 'Density', 'Density Profile', 'Distribution Function', 'Dynamic Pressure', 'Energy Flux', 'Energy Spectra', 'Flux', 'Mass Spectra', 'Pitch Angle Distribution', 'Pulse Height Analysis', 'Temperature', 'Thermal Pressure', 'Time of Flight', 'Velocity'. The attribute particle:Particle_Parameter/particle:particle_type must be equal to one of the following values 'Electrons', 'Ions', 'Neutrals'.