Symptoms:
When trying to recompile invalid objects by running the utlrp.sql script, the below error is thrown:
"XDB now invalid, could not find xdbconfig"
 
Furthermore, Oracle XML Database (XDB) is INVALID.
Error:
ERROR at line 1:
ORA-31024: Parser initialization failed with LPX-201 error
while parsing a stream to XOB
ORA-06512: at "SYS.UTL_RECOMP", line 865
ORA-06512: at line 4