Simon Willison’s Weblog

19th November 2025

Tool XML Well-Formedness Validator — Check XML documents for well-formedness by pasting content into the input area and clicking the validate button. The tool parses the XML and displays any syntax errors with precise line and column information, highlighting the problematic line in the code view below.

Posted 19th November 2025 at 8:06 pm

Recent articles

The new GPT-5.6 family: Luna, Terra, Sol - 9th July 2026
sqlite-utils 4.0, now with database schema migrations - 7th July 2026
sqlite-utils 4.0rc2, mostly written by Claude Fable (for about $149.25) - 5th July 2026

This is a beat by Simon Willison, posted on 19th November 2025.

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe