Here is a list of all documented variables with links to the class documentation for each member:

color_space : Legion::OutputRequirement
field_space : Legion::OutputRequirement
flags : Legion::RegionRequirement
global_indexing : Legion::OutputRequirement
handle_type : Legion::RegionRequirement
instance_fields : Legion::RegionRequirement
NO_PART : Legion::LogicalPartition
NO_REGION : Legion::LogicalRegion
NO_SPACE : Legion::FieldSpace, Legion::IndexSpace
parent : Legion::RegionRequirement
partition : Legion::RegionRequirement
privilege : Legion::RegionRequirement
privilege_fields : Legion::RegionRequirement
projection : Legion::RegionRequirement
projection_args : Legion::RegionRequirement
projection_args_size : Legion::RegionRequirement
prop : Legion::RegionRequirement
redop : Legion::RegionRequirement
region : Legion::RegionRequirement
tag : Legion::RegionRequirement
valid_requirement : Legion::OutputRequirement