JExpression cons = coreType.createConstant(outline, lexical);
Class<? extends XmlAdapter> atype = adapter.getAdapterIfKnown();
// try to run the adapter now rather than later.
if(cons instanceof JStringLiteral && atype!=null) {
JStringLiteral scons = (JStringLiteral) cons;
XmlAdapter a = ClassFactory.create(atype);
try {
Object value = a.unmarshal(scons.str);
if(value instanceof String) {
return JExpr.lit((String)value);