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The list of errors for the fn:unparsed-text function in section 14.8.5 of the F&O Members-only last call working draft consists of err:XTDE1170, err:XTDE1190 and err:XTDE1200, all of which are XSLT error codes. I'm guessing that new F&O-specific error codes need to be defined.
In the latest draft these have been replaced with codes carrying the "FO" prefix. In future, now that programs can depend on error codes by virtue of try/catch, it's going to be rather harder to change error codes without impacting backwards compatibility.