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LPX-00109:

duplicate name "~S" in mixed-content declaration
Cause: Validity Constraint 3.2.2 failed: "The same name must not appear more than once in a single mixed-content declaration." *Example: <!ELEMENT p (#PCDATA|a|b|c|d|a)> *Explanation: 'a' occurs more than once in the mixed-content declaration.
Action: Correct the DTD.