2200MERRORTier 2 — Caution✅ HIGH confidence

invalid XML document

Category: Data ExceptionVersions: All Postgres versions (XML support must be compiled in)

What this means

SQLSTATE 2200M is raised when an XML document fails document-level validation — it may be syntactically malformed or violate XML well-formedness rules.

Why it happens

1XML input with unclosed tags, invalid attribute syntax, or other well-formedness violations
2Invalid XML declaration or encoding declaration

How to reproduce

Parsing malformed XML.

trigger — this will ERROR

SELECT XMLPARSE(DOCUMENT '<unclosed>');

ERROR: invalid XML document

Fix 1: Validate and fix the XML structure before storing

When XML data comes from external sources.

fix

Why this works

Use an XML validator or library in the application layer to confirm well-formedness before sending to Postgres.

Sources

📚 Official docs: https://www.postgresql.org/docs/current/errcodes-appendix.html

🔧 Source ref: Class 22 — Data Exception

Confidence assessment

✅ HIGH confidence

Standard SQLSTATE for XML well-formedness. Stable across versions.