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

Perhaps not Boring Technology after all - 9th March 2026
Can coding agents relicense open source through a “clean room” implementation of code? - 5th March 2026
Something is afoot in the land of Qwen - 4th March 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