Hello Colin The only example i want to pass would be the first one i.e. with the format '{8-4-4-4-12}' (e.g. {BCB385F9-2A19-5ADC-E040-A40A272C6A8A}). Whilst i am aware that technically the 4th one does follow that rule, and is again technically alphanumeric. What i am trying to trap is when only zer...

I am trying to restriction a value that is allowed to be captured for a particular feature. My current schema has the following <?xml version="1.0" encoding="UTF-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:gml="http://www.opengis.net/gml"...