ORA-19151: XQST0093: It is a static error to

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ORA-19151: XQST0093:It is a static error to import a module M1 if there exists a
sequence of modules M1 ... Mi ... M1 such that each module directly dependson
the next module in the sequence (informally, if M1 depends on itself through
some chain of module dependencies.)
Cause: An error occurred during the processing of the XQueryexpression.
Action: Checkthe detailed error message for the possible causes.