added xml api comments to explain query plan
added xml api comments to explain query plan

jokokko/marten,JasperFx/Marten,mdissel/Marten,jokokko/marten,jmbledsoe/marten,mysticmind/marten,mdissel/Marten,jokokko/marten,ericgreenmix/marten,mysticmind/marten,jamesfarrer/marten,ericgreenmix/marten,mysticmind/marten,jmbledsoe/marten,jamesfarrer/marten,ericgreenmix/marten,jamesfarrer/marten,jokokko/marten,ericgreenmix/marten,tim-cools/Marten,jokokko/marten,jmbledsoe/marten,jamesfarrer/marten,JasperFx/Marten,JasperFx/Marten,mysticmind/marten,tim-cools/Marten,tim-cools/Marten,jmbledsoe/marten,jmbledsoe/marten