Dennis Lin

Fix base_dir updating for nested .xsd dependencies

2

Say we have the directory structure as follows: `/BASE.xsd` --> Depends on `deps/Dep1.xsd` `/deps/Dep1.xsd` --> Depends on `Dep2.xsd` `/deps/Dep2.xsd` Parsing `BASE.xsd` from within its containing folder would result in `base_dir`...