longitude range

[nschorgh]

On Earth, the range of geographic longitude is conventionally -180 to +180 degree, and CaveXML restricts it to that range. On the Moon and Mars, on the other hand, it's 0 to 360 degree. XML 1.0 doesn't allow for restrictions that are conditional on other fields, so this would require changing over to XML 1.1. A quick fix would be extend the allowed latitude range to [-180,+360].