With the current spec for object/@datatype, it is impossible to declare data types not in XML Schema.
You can type your object literals with this attribute. The attribute value can contain any of the official data types from XML schema (like integer, float, double, decimal, time, date etc.) [specs]
But there are cases, where other datatypes must be expressed.
For example, there are datatypes in gis, like https://docs.cordh.net/modelling/#spatial-coordinate
<https://collection.itatti.harvard.edu/resource/ex/place>
a crm:E53_Place ;
crm:P168_place_is_defined_by "POINT (9.1232696 45.2503146)"^^geo:wktLiteral .We want to be able to extract such patterns. See our recipes.
With the current spec for object/@datatype, it is impossible to declare data types not in XML Schema.
But there are cases, where other datatypes must be expressed.
For example, there are datatypes in gis, like https://docs.cordh.net/modelling/#spatial-coordinate
We want to be able to extract such patterns. See our recipes.