LPX-00108：parameter-entity parenthetical cannot be split up

错误原因：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)> ]> greetingHello!/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.