The LandXML 1.2 Schema does not have anything relating to a Corridor. So when you include the Corridor in the Export, the Alignment(s) defining the baselines of the corridor will have CrossSects entry with a CrossSect entry for each corridor frequency line. There will also be a Roadways section with one entry for each alignment with the Design Speed data
This image shows the same drawing exported to LandXML 1.2, the one on the left I included the corridor, whereas the one on the left I excluded it.