[ubl-ndrsc] representing integers, language

Dear all in looking at our facets Mavis and I have been considering how we can represent the different built in types by using representation terms.
We are specifically concerned about integers, and language .
Are there any ideas on this?
Should we generate some new secondary representation terms?
Language is easy to handle.
We can define a secondary rep term called language type.
However, integer is more problematic because the name itself is not a common business term.
What should we define instead of integer?
Regards Gunther