Allowed characters in field name prefix #57
Description
It may be useful to provide guidance on allowed characters in the "field name prefix" for new STAC extensions. This to avoid issues when the "filter" extension is used with CQL2 Text expressions and properties defined in the extension. E.g. the use of "-" in the prefix violates the rule given for PROPERTYNAME given in https://docs.ogc.org/is/21-065r2/21-065r2.html#cql2-bnf.