xml input data

hi,

i'm using occjava and viewer3D in my project and the input data is an xml file that describes cylindric and parallelpiped geometry with a floor and a ceiling not horizontale...vertex and slops are used.
so my question is: what's the best solution to wrappe this data with the data tacken in charge by opencascade. should i wrappe the xml file to an BRep or step file or should i only build the corresponding opencascade structures and which solution is the easiest one.