swe:RepresentationType

this uses components copied from XML Schema to describe the "value-space" in terms
of
a base type and facets, or a composite such as a union.
For numeric types this will normally indicate integer, double etc and (optionally) facets
to describe one or more intervals or a precision.
For textual types this will normally indicate string, token etc and (optionally) facets
will indicate a pattern, enumeration, length etc.