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How to fix: Element '...' contains an invalid character

What happened?

XML can only contain legal Unicode characters. Special characters like &, <, >, and control characters from copy-pasting will crash the XML parser before it even reads your data. Emojis and non-printable characters are also rejected.

The Zero-Tolerance Solution

XMLExpress automatically escapes all special XML characters (& → &amp;, < → &lt;, etc.) and strips non-printable control characters during generation, ensuring every file is parser-ready.

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