Answer / guest

Cause: Validity Constraint 3.2.1 failed: "Parameter-entity
replacement text must be properly nested with parenthesized
groups. For interoperability, if a parameter-entity
reference appears in a choice, seq, or Mixed construct, its
replacement text should not be empty, and neither the first
nor last non-blank character of the replacement text should
be a connector (| or ,). *Example: <?xml version="1.0"?>
<!DOCTYPE foo [ <!ELEMENT greeting (#PCDATA)> <!ENTITY % e
"(#PCDATA|"> <!ELEMENT foo %e; greeting)> ]>
<greeting>Hello!</greeting> *Explanation: The parenthetical
content of the 'e' entity may not be split up into sections:
both open and close parentheses must be in the same declaration.

Action: Correct the DTD.

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