VegX mappings: Changed taxonDetermination of role identifier to instead have explicitly no role, because data providers' VegX files generally do not provide role information and we don't want the default taxonDetermination XPaths to require this
VegX mappings: Changed taxonDetermination of role identifier to instead have explicitly no role, because data providers' VegX files generally do not provide role information and we don't want the default taxonDetermination XPaths to require this