Where does the ENHANCEED_FIELDS list in CmpJpaConversion come from?

[Rick McGuire]

The CmpJpaConversion.mapFields() method uses a list called the 
"ENHANCEED_FIELDS" to mark a number of fields as transient.  Some of 
these certainly make a lot of sense, such as "serialVersionUID" and 
"class$Ljava$lang$String".  I am curious about the different "pc*" 
fields.  I've not found any reference to these in the OPENEJB code.  Are 
these fields something that would be generated by JPA?  Are they OpenJPA 
specific, or something that any JPA implementation would be using?  I'm 
particularly curious if this is something that would need to change if 
support for additional JPA engines (e.g., EclipseLink) were to be added.

Rick